StarTalk Radio - StarTalk Live! Parasites and Poisons at The Bell House

Episode Date: September 13, 2015

A strange brew of poisons, parasites and infectious diseases is on tap at The Bell House when Neil deGrasse Tyson and Eugene Mirman welcome guests Mark Siddall, the Leech Guy, and comedians H. Jon Benjamin and Jessica Williams. Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to new episodes ad-free and a whole week early.

Welcome to StarTalk, your place in the universe where science and pop culture collide. StarTalk begins right now. Well, have we got a show for you tonight. Do they know the topic? No, they don't know the topic. They don't know the topic. You all came not even knowing the topic. No.

The topic is poisons, parasites, and infectious diseases. The enthusiasm I've come to expect. I want to bring out my special guest for this. Believe it or not, there are people in the world who are experts at this stuff. He's a colleague and friend from the American Museum of Natural History. Give me a warm Brooklyn Bell House welcome for Mark Siddharth. Mark! Thank you. it up. Mark!

Thank you, man. Mark curated an exhibit on poison at the American Museum of Natural History. So, I got my man. Who'd you bring? Damn. Oh, can you do better? Certainly not in the world of poison

But I will bring two comedians out One is a bit of a father and a bit of a spy From Bob's Burgers and Archer H. John Bessemer Thank you Tonight I will be playing the part of the parasite Thank you. Tonight I will be playing the part of the parasite. I'm Jewish, so there you go.

Oh, by the way, just every night that we do this, we create a special drink just for that evening themed by that topic. And so Kim, the bartender, earlier she and I concocted a parasitic poison drink. That's what it's called. A special drink just for this evening. It did not exist before tonight.

Boy, you really phoned in the name of that one. You didn't even go for like Parasitini or anything. Alright, our final guest. She is awesome. This is so exciting that she could make it. From The Daily Show, ladies and gentlemen, Jessica Williams! Hi guys.

Hey. All right, let's get this party started. So let's just clarify. So, Mark, you're curator and professor at the Sackler Institute of Comparative Genomics in the Division of Invertebrate Zoology at the American Museum of Natural History. His professional expertise is leeches. And in fact, his Twitter handle is The Leech Guy.

I am The Leech Guy, and I can attest that Neil deGrasse Tyson could never possibly get that name, because when we went in the field with Nova Science Now... Yes, we profiled some of his work back when I was hosting Nova Science Now. It took me into a leech pond. And they wouldn't feed on you. Yeah, yeah that none of the leeches I Felt unloved because they he got out the leeches all I had no leeches on me at all Did I ever say I they fed here and I swelled from my knee to my ankle? That's I did this for you. So that's really really creepy How do you get dates? Yeah, is that what it says on your Tinder?

Well, I don't need dates I have a charming and lovely wife Who actually illustrated the book I wrote Oh, yes, yes, yes, there's a book It's not about leeches We'll do a leech book next Okay These are the stories about poison that we couldn't put in the exhibition. So sinister species with deadly consequences. Yes, indeed. It's not an allegory for our marriage.

I just want to make clear. And your wife illustrated the book. Yes, I believe she's in the audience. Aren't you, Megan? Over there. All right. All right. You couldn't get her a seat, apparently. Okay. So let me ask you, Mark. Let's just start off. Isn't it true that almost anything will kill you given a high enough dose?

So how are we to know what's poison and what's just someone being stupid? What's the most amount of regular blood you could drink before it was like too much? Did you say blood or alcohol? I'm sorry, I didn't get that. Poison is blood. So poison's a funny concept. If you ate enough hammers they'd kill you, right? Does that make hammers poisonous?

No. So the way we tend to think about it has to do with whether or not they're screwing with their physiology. So salt. You all need salt or your nerves don't work. Sodium chloride. All of your nerves use sodium to get their stuff done. If you eat like a cup of salt, it'll shut that down. That's poisonous.

Water. Well, you drink too much water, it dilutes everything. Is it really a poison? well, you drink too much water, it dilutes everything. Is it really a poison? It's not really a solid concept as to what is a poison or what is not. It has a lot to do with... The field has yet to define poison. This is what you're telling me.

I think I am. And in fact, when we were working on these ideas... For the exhibit. Yeah. The intersection between the concept of poison and toxin and venom and so on was really a very English language centered kind of semantic argument. And we just gave up on it. So toxins and venom. I mean, how many movies have extracted venom from a frog or a snake, put it in a bullet? And, you know, there's a lot of this.

Seven. You know your movies. Name them. So, no, go ahead. No, I would rather be cut off. Where? Oh.

Oh. Wow. Very, very fun. Okay, so poison affects you chemically, just the very, very front. Okay, so poison affects you chemically, that's what you're saying? It affects you physiologically and invariably is chemically, yes. And so when I think of some poisons that are just chemicals that you might find out there, like arsenic, right? Yes, or dihydrogen oxide. You mean water?

Yeah, water. Who do you think you're messing with here? Yeah, who do you think you're talking to? No, but this actually makes a point. People think things are poisonous because they're complicated. Tell that story. You know the story about dihydrogen oxide. Oh, no, you tell them.

The story of water? Yeah, yeah, yeah. No, no, no. No, it's a good story. Go on. Some of you might want to leave. There was a kid who was sort of testing the gullibility of the public, or at least their fear of science and things that sound bad,

set up a petition in the street to ban dihydrogen oxide. Because if inhaled, it creates suffocation. It is the biggest ingredient in acid rain. It sure is. And you go down the list. Everybody signed

the petition. Oh yeah, I would have definitely signed the hell out of that. So this is something that we get at the museum, right? Is what's it like living on a planet with poison gas? Because that's got to be terrible. Yeah. So far, I agree. So far, I love it.

That's why I don't leave Earth. So it turns out you're living on one. One of the most destructive elements to your body is oxygen. I mean, all of the things that oxygen does to your DNA is absolutely terrible. This is a poisonous planet, and we're surviving. It's amazing. So we should go in a room with no oxygen,

and we'll be healthier. What are some of the bad things? I'm just going to go home and eat a bag of hammers and get it over with. Please elaborate on all the things that oxygen does to my body, because I am a hypochondriac, and this is a wonderful episode for me to be involved with right now.

I'm right there with you. Suffice it to say, ripping your DNA apart is probably not a good thing. Yeah, but it obviously takes its time. Wait, wait, wait. We're comparing ripping your DNA apart eventually and dying within three minutes. Oh, no. There's only one thing that will kill you in three minutes. Do tell.

What's that? It's not a bad joke by Jon Stewart. Whoa. I don't know. I don't care. Wait, what's the Jon Stewart joke? I'm so screwed.

I'm never going to be invited on this show. Is this something from Big Daddy? No. I'm just saying. Do we want to dig deeper into his film career? I don't know. I'm just saying, if you complain about oxygen, if you don't have any oxygen at all,

you will die sooner than whatever bad things the oxygen did to your DNA would kill you. Right? Is that a fair statement to make? Probably. So the thing is, is that what we're doing in our own bodies is ripping electrons off of things and giving them to oxygen at the end. That's how we get energy. But that's a pretty caustic thing to be doing. And we've got enzymes and other things in our body that make that happen and we control all the free radicals

and so on but it doesn't mean that oxygen isn't toxic it's wicked toxic it's horribly toxic there's a huge cottage industry on antioxidants what do you think that's about that's what anti i never even thought about the word, but I was buying all of it. All right, so of all the animals out there, how many are poisonous? So poison and venom is a funny thing. So I like to say that there's no such thing as the poisonous snake. There isn't a single snake you can't eat. You can eat a snake. Now wait.

He's looking at you, man. Yeah. There are boatloads of venomous snakes, and of course the Aussies. Are there any Australians in the audience? Oi. Oi. Oi? Is that what you...

I can... So Australians love to say, oh, wow, we've got 18 of the most venomous snakes on the planet, and 12 of the most venomous spiders, and 8 of the most venomous fish, and planet and 12 of the most venomous spiders and 8 of the most venomous fish and yadda yadda yadda yadda. Okay, fine. But you're really very... An idea of the drunkest ladies. You're really

unlikely, extremely unlikely to die of any of those things in Australia because Australia has western medicine like we have and you're probably going to survive. The place where you're going to die of any of those things in Australia because Australia has western medicine like we have and and you're probably going to survive the place where you're going to die from a snake bite is where you can't get care at like Burkina Faso from a snake that's not nearly as venomous but you're just not going to find care okay so you're cool with venomous animals out there just as long as you have a snake bite kit next to you.

I just want to get a sense of how dangerous it really is out there. I don't like snakes. How long would it take that snake to kill you? The one that you just mentioned. I didn't actually mention it. The snake where you're somewhere and it takes a while. In Australia, the inland type and there's a guy named

Kevin Budden who A snake? No. What, they're naming him one by one now? Oh, yeah, that's Kevin. He'd be my cousin. So this guy, Kevin, he's a herpetologist. It turns out that most people who die of snake bites are probably herpetologists because

they're the ones who are handling snakes. You're the ones who study snakes. I'm hoping. Herpetologists? I could help you with that. They don't study herpes. They study snakes. Sick. Sick job. Better job. So herpy means creeping. Creeping.

I didn't know that. So we're in the same place here. Good. Alright. So this guy Kevin in the 50s, he found this inland type in and he grabbed it with his arm and it wrapped around and it started spitting all over him and he couldn't hold on to it. Some guy drives up in a pickup truck and

sees this guy in distress and says, oh, come on, get in the cab. So he gets in the cab and he explains that he's got this incredibly venomous snake, the most venomous snake on the planet. The guy who's driving the truck is like, um, can you maybe get out? But he takes him down to the museum. Unfortunately, the snake gets away,

bites Kevin Budin. The point of Kevin... Wait, he takes him to a museum? The Museum of Natural History. These are great places where lovely things happen. I work at one. I thought of the story someone was bitten by a poisonous snake

and then taken to a museum. I get why museums are great. That's what you did back then. I'm doing a little story contraction. Okay. That was hard to follow, though. So, unfortunately, Kevin died. He was bitten...

That's a lot of contraction! It's because they took him to a museum instead of a hospital. What year was this? It was in the 50s. Yeah. They didn't know the difference between hospitals and museums. So anyone who's been bitten by this incredibly venomous snake in Australia

has Kevin to thank because that very snake was the source of anti-venom, which we can create if we have a live animal. And he insisted that that animal never be killed so that it could be used to create life-saving... I do have a question. How do they make anti-venom, though, from a live animal? So that's a great story, especially as it concerns the origins of it. The

United Fruit Company, which you all know is dull. I didn't know United Fruit Company was dull. I thought he made it up. Did anybody else? Was I the only one? It's now dull. No. Okay.

Great. Somebody from Monsanto knew. They're everywhere. Logical progression. You clear a forest, you plant banana trees to sell bananas to people in the United States. You've got a lot of people

who are working in those banana plantations. And all of a sudden, you've got a lot of rodents in there that are eating the bananas that are not being sold to Americans. So the snakes come in and start eating the rodents. But then people are working in a place with a lot of snakes. And people start dying, getting bitten, and so forth. So the United Fruit Company created serpentariums in places like the Honduras and also down in Brazil in order to find ways to create anti-venoms for the workers so that if they got bit, you could save their lives. So, okay, as a leech biologist, the thing I've decided to study as a biodiversity scientist looking at leeches,

they're attractive to me, so I don't have to really go looking. Oh, that was clever. Yes. Wow. How hard is it to find a black hole? No, we can find it. We just can't.

We're not going to bring it. We're not going to bring it into the lab. Well, no, they'll bring ours eventually. Yeah, yeah, they'll get us. It's a long way. I happen to know somebody. You're not the kind of leech guy who studies the leeches that lodge inside of a hippopotamus rectum, are you? Yeah.

What kind of a leech guy are you? I'm actually. Are you a hardcore leech guy or are you like. I don't come in the rectum. So, yes, I am that leech guy. You are. Oh, wait. But I noticed that you just brought black hole and leeches into the same sentence with the hippo rectum thing.

Because that's how I roll. Just so you know, I'm that kind of hippopotamus. Have I got an undergraduate for you? Have you got a forearm for me? Here's what I want to understand. All of these ways animals and plants can poison you or stick venom in you. Could you give us an overview on what their poison and venom does to your body because there was a whole recitation in kill bill with wet as as daryl hannah daryl hannah watches the guy die as she's thumbing through her her google notes on how so could you give us some well that was a black mamba and black

mamba well she was black mom that was her of. There was a Black Mamba. So snakes actually, typically with a snake, there's a cocktail. And similarly, like your cocktail, there are lots of poisons in things like snake venoms and in plants and so forth. Very rarely will you find any animal that has only one or plant that has only one. When I said that I love plants because they can't run away, they're defending their souls with something. Nicotine, caffeine, theobromine in cocoa, all of these things are actually insecticides.

Meaning insects won't eat caffeine plants. They eat them and they go lie down in a hammock and go, I need more chocolate. Or that's a self-defense. That's the way. So the ingredients that resist insects, we find other uses for them that are recreational. Absolutely. Cinnamon, vanilla, all of those things are insecticides.

They're delicious. If you're not an insect. Which means you're not an insect. Yeah. That's evidence. That's how you can tell. That's the test I do. That's the evidence, yeah.

I'll give someone vanilla, and if they eat it, I'm like, not an insect. Would you like to get dinner sometime? So, all right, so I get it. So that's fascinating to me, that there are chemicals out there that the plant uses to protect itself, yet it doesn't work when humans come in because we, they're recreational drugs for us, right? Well, it sometimes does work in the sense that things in the Belladonna family, for example, Belladonna.

That's a famous group of food porn stars. Sure. We get a... A family of porn stars. A family of porn stars. Which is flying ointments, where basically plants ground up and smear it on the skin. Now, it's a very bad idea to do this. We have this thing that we call a therapeutic index, which is the difference between the effective dose and the lethal dose. And you really want those to be very, very, very far apart.

Because if the effective dose is very close to the lethal dose, then you could overdose very easily. That's death. Just making sure you're with us You got that one I got you I'm not with you for a lot of it Look

I ain't with you with death It's why people warn you about heroin Heroin Very good example And by the way Yes Wait wait Give the example

Don't by the way yet Give me the What are you saying? Mushrooms Yeah Yeah Psilocybin Wait wait Confirm what I've just learned Wrap it up Burning Man I just learned What are you saying? Mushrooms. Yeah? Yeah. Psilocybin.

Wait, wait. Confirm what I've just learned. Wrap it up, Burning Man. I just learned. This year, I learned. Please confirm for me. That humans or mushrooms are more genetically alike than either humans or mushrooms are to green plants. Oh, clearly. Yeah, of course.

Their sperm is the same. Wait, wait. Okay, I didn't get that. Let's go back. Let's go back. I didn't. Their sperm is the same. Wait, wait. Okay, I didn't get that. Let's go back. I didn't get that far in the similarity. As is the evidence, their sperm is the same. You didn't want to go there, did you? I didn't know that that was a place to go. Wait, what did you say?

What about the sperm? What did you say about it? Yeah, sure. Wait, I've been following nothing, and then that? It's just science. Yeah, yeah. All right, wait. So you got to bail us out of this one. Okay, let's go back to them.

I just said we're related. You're talking about sperm. Okay, they're not exactly the same, but they look the same. So mushrooms, let's go back to psilocybin. I think we're safe for that. Please, okay. Just for that guy.

So which of you three have ever done, no, I'm not going to ask you that. Unless you want to answer. All together or just individually? Do you want three people to go like when I was 19? So psilocybin, the effective dose, the dose to get whatever effect that you might possibly want, is measured in femtograms.

Now, you're the astrophysicist. How many zeros? That's a metric prefix of a very small number. Right. So femto, so we have, I don't know, femto. That might be 10 to the minus 15 or 10 to the minus 12. So like 14 zeros and then a something? No, minus 12.

So it would be like. And you don't want to switch to ounces right now? No, mine is 12. So it would be like... And you don't want to switch to ounces right now? You want to figure out the femtogram. Do you want the smiley face or do you want the rainbow? Please don't draw on my face. So it's measured in femtograms.

Just to be clear. So nano, as in sort of nanotechnology, that's one billionth of a thing. And I think femto is like a millionth of that or a thousandth of that. Yeah, no, a thousand sort of nanotechnology, that's one billionth of a thing. And I think femto is like a millionth of that? Yeah, no, a thousandth of that. So you have nano, femto, oh, it's a pico. Thank you. Oh, right, yeah. I think it's nano, pico, femto, ato.

Can we agree that it's a very small number? Yeah, yeah, yeah. That's what I was asking. Whatever this number is, it sounds like I took too much. So therapeutic index is the ratio of what is effective for what you want and what is lethal. The lethal dose of magic mushrooms is 15 pounds. Really? You have to eat 15.

Can you even fit 15 pounds? I feel like I was like 15 pounds would be It's a mound Mostly air I'm thinking you're walking in front of a bus before that

Yeah And after So if any If you're listening They're safe Yeah. And after. So if any... Yeah. If you're listening, they're safe. So, wait, just... Wait, wait, just wait. This message is not endorsed

by the American Museum of Natural History. Just by those who work there. So... And where in the back I get my mushrooms. So some of these things people do recreationally, but other things we come next to and snuggle with knowing it'll kill us. Like in Japan, they have the puffer fish. What do they call it?

The fugu. Fugu. People eat that, and that'll kill you. Yet they eat it. Sure. Why? I don't you. Yet they eat it. Sure. Why? I don't know. It's tasteless.

Really, it's terrible. Look, okay. And I think they eat it because of the risk of dying like a kabuki actor. What was his name? Do you remember? There was a kabuki actor. Marcel Marceau. Why am I looking here?

My total recall for kabuki actors is... I brought some poison. Would you like some? That's a book. Or is it poison inside it? No, that's a really bad... What is this book? It's a really unfortunate way to hide poison.

Wait, wait, wait. This is... Oh, that is a bunch of poison. Sorry, that's not a book. You really brought poison. You walk around with this? But is one of them salt and peppers? Well, here, if you'll allow me.

Can you clarify this for everyone really quickly? Barnes & Noble was fooled entirely by this. Security at the Bell House was fooled entirely. So just a couple of things. Would you pass that to the gentleman on your right? Careful, dude. Mark is now passing around poisons among the panel. Passing cinnamon bark.

Do I have to wash my hands? Well, if you don't like the smell of cinnamon. Cinnamon, he's right. As we said earlier, a lot of the things... Just eat all that now, quickly, and it'll be over soon. Eugene, why are you licking something out of a box called poison? Poison. Because, first of all, I trust him.

Second of all, it tastes like cinnamon. Thirdly, you shouldn't trust me. Here's some curare. What's that? Ah, don't lick it, I think is the word. It was really when you said cinnamon bark that I stopped being scared. But when you said the other word, I am a little scared. But it does raise a really good point.

Plants can't run away, so they're producing things to protect themselves from insects or herbivores. And we, being thoughtful-thinking human beings most of the time, have figured out how to leverage these things for our benefit. Sometimes, for example, for hunting. Sometimes for medical purposes. Hunting as in tips of arrows that would show? Sure, yeah. There's a bug. I shouldn't call it a bug. It's a beetle larva bug that the San in South Africa would grind up and put on arrows in order to take down big mammals. It turns out that whole mythology of elephants chewing on marula fruit and getting high and getting a little bit drunk,

there's not enough alcohol in marula fruit to make them drunk. They're getting high off of the toxin from the beetles in the marula tree, which is the same one the Sam were using for killing things. Because an elephant's a big animal. So elephants can get drunk off of beetles?

Yep. Beetle juice. Yep. Say that three times. What's in your alcohol? Number one cause of poisoning in the world. Alcohol? Just to clarify,

what you're saying is, what we call poison is in some sense, it's biologically arbitrary, because it's the thing that'll kill us at a particular dose but other doses could be just fine be recreational and we'll have fun and medicinal and all the rest so for everything we ingest we got to measure where it kills us then we call it a poison so i'm going to say i'm going to pull a neil degrasse tyson on you anytime it's not it's not biologically arbitrary it It's actually biologically measurable.

We can actually measure the... I really didn't mean arbitrary. I meant you don't know in advance that something is poison until it kills you, and then you back off from that a few notches. Oh, and then you say it's recreational. No, it's actually worse than that. So, the way

this is measured is LD50, lethal dose 50. What that means is that you've got at least 100 things and you've killed 50 of them with some dose and then you know what yeah it's bad say that again but quicker no LD50 lethal dose 50

you actually have to have like 100 mice and at what dose do half of them die oh nice what's nice is that we don't do it with comedians. We do it with mice. Yeah. It would, I imagine, be illegal. Well, my guess is it usually takes a higher

dose for comedians. Yeah, yeah. We're going to wrap this segment. Just for the wrap-up, tell us what your favorite poison is. You can buy whatever metric you choose. Because you're the man who's the poison man. So you're going to tell us all what's your favorite poison.

It's like asking what's your favorite child. I'm sure it's exactly like that. A true psychopath. Okay, I got to say it's probably tetrodotoxin, which is the poison in the puffer fish that you were talking about. It's a poison that acts on neurons, but what's amazing about it is it does not affect your heart.

So you get to stay alive as you're dying. Oh, it's like real torture. It's total, total... Does it hurt, or is it just upsetting? Actually, you don't feel much pain. You don't feel anything. But your brain's working and your heart's working and you're zombified.

Well, so your brain is working differently then, right? Wait, wait. So what you're saying is... How do you know what you're feeling? You have an awareness of your death and there's nothing you can do about it. Well... Was it like the diving bell and the butterfly? No, no, no. Is it that? You have an awareness of your death, and there's nothing you can do about it. Was it like the diving bell and the butterfly? You have an awareness.

Like kiss at a dragon. Did you see that? You have awareness of all the people around you. I missed that one. I'm sorry. That was a great one. That's a classic. Oh, yeah.

With the pin, and he puts it in the guy, the French police. Yeah, yeah. It's sick. It's sick. Okay. You have an awareness of all the people saving your life Because you actually get to see them You get to hear them, whatever

But tetrodotoxin is kind of interesting Because we know it from pufferfish We know it from blue-ringed octopus We know it from the rough-skinned newt in Oregon And we only know that because some guy Decided to eat his own pet in a bar People shouldn't eat their pets It's a bad idea

because they're probably toxic. That's why you shouldn't eat your pet. Because it might be toxic. Okay. so does every animal out there have some parasite that just loves sucking its body fluids well given that most of the animals out there are parasites, because every animal that's not a parasite has about five to a hundred, parasitism is the most successful strategy

for animals all over the place. Way more than 60% of all animals are parasites. What are we? Parasites. Right? According to the matrix. So, what you're saying is it's easier, evolutionarily speaking, to figure

out how to live off the nutrients derived from the fluids of another creature than to... Get a job. Yeah. That's what you're saying.

Part of the problem is that we consider things like tapeworms to be parasites. We consider malaria to be... Consider tapeworms to be parasites? We sound real judgy. We consider tapeworms to be parasites, malaria to be parasites. And they don't physiologically do the same thing.

And we call them parasites. So this is really just a semantic argument about what is a parasite in certain respects. There's a textbook written by a friend of mine, John Genevieve Jr. And if you look in the glossary under... No, really, that's his name. You made up that name. I'm just saying. Definitely struggled through it.

Jeremy Jr. Last name Junior. Junior. You know, he's going to listen to this. He doesn't exist. Enough with the sham already. You have no friends.

Oh, come on. I don't mean that. I'm okay. I'm your friend. So the definition of parasite is the raison d'etre Of parasitologist And if you go to the glossary under parasitologist It says it's a quaint old fool Who sits on one stool while looking at another

Hey but seriously though This is all great But how many parasites do humans have Yeah I'd like to know that What do I have What parasites do we have? What do I have? What parasites do we have? What do you want? None of them.

Does she have any parasites on her right now? Well, sure. She's got Demodex follicularium probably up in her eyelashes. Great. Good night. Bye. Good night. Which one of these classes of organisms which shows up a lot when we read about worms

like nematodes and things. So how many of them are worms in our body? Yeah, how many worms do we have? You might actually leave. Okay. Shall we just go with New York? Yes, yeah. Sure.

Okay. What do you mean? There's like a lot, like Boston's like, ooh, you don't want to hear about that? They have all their Cambridge worms. Everybody out there who had an itchy butt when they were a kid, raise your hand. Okay. All of you who are lying, raise your hand.

So pinworms, pinworms. What about now? Yeah. Crying, raise your hand. So pinworms, pinworms. What about now? Like right now. So pinworms. Pinworms are a very common nematode. Even in the developed world, the females lay their eggs in the... In your butt. Cause intense itching, and it's actually adaptive for the organism

because it's itchy, you scratch, and that lofts the very lightweight eggs into the air, and everybody around gets infected. It's an incredibly wonderful way to transmit. Sick. Don't awe, because you all got it. Okay, what's the third creepiest parasite? No person is an island under themselves.

And you're never alone if you're parasitized. But how many, do I have like 10,000 parasites? But are there like 10,000 parasites or are there like 85? Are you talking about number of individual parasites or species? Species, yeah.

So we're host to they're like 85. Are you talking about number of individual parasites or species? Yeah, species. So we're host to somewhere in the hundreds to low thousand kind of range that are... No, these are just things that are strictly things that are only in humans or not in any other animal.

Sure. Oh, I feel better. Yeah, yeah, yeah. I was like, I don't have to share my parasites with cats. No, this is great. Wait, wait.

So these are living organisms. We're their universe. And we are the... They thrive within us. Only us. Unless they're getting between us. Then they're kind of not with us. But do we need them to?

Please say yes. Ooh, that's a good one. Yeah, yeah, yeah. Great question. Yeah, maybe they clean our hair and give us mustaches. Yeah, yeah. Yeah, yeah.

How many... I don't know how, yeah. How many do we have a symbiotic relationship with? Well, the good news is the word symbiosis just means living together and that includes parasitism. So you're thinking of commensalism or mutualism. Yeah, that's what I meant. Whoa.

I was testing you on that one. So, I'm sorry. Was there a question? Yeah, yeah. The question was sort of how many things live, what we used to call symbiotic, but I forget the new word, on me. Stuff that'll screw you up kind of thing? No, something that's like hey, thank God it's there because it'll eat all your

rice. So what we do know... I don't know, but you get it. The extra rice that you will not eat. Yeah, exactly. And I just keep on my torso. we do know... I don't know, but you get it. The extra rice that you will not eat. Yeah, exactly, and I just keep on my torso. We do know that your immune response is educated by some of the things you might get when you're young, including parasites. We do understand that some allergic-related things, some asthma, not all asthma, is correlated with environments where you don't get exposed to parasites when you're younger. We also know that for some people with things like Crohn's

and a few other immunologically-related diseases, you can actually give them parasites, and it makes them better. It makes the disease, it makes you better. One woman loves Crohn's. It makes you feel better. It makes you feel better. So when you're young, exposure to some classes of parasites help out your

immune system for later. So that you become stronger. More resistant. It's hard to do controlled studies on humans. Yeah, yeah, completely. Not for me. Yeah, yeah, yeah. You have a big basement

an unstoppable addict all right how about malaria uh now we're screwed how many people die malaria i mean what's up with that why don't you fix that malaria is-bowl because only humans get it. Ebola is like, just forget it. You can't eradicate Ebola because it's in all the bushmeat that people eat and then get Ebola by eating bushmeat. So don't eat bushmeat or you'll get Ebola

and kill 100,000 people. Bushmeat? What is exactly bushmeat? It's like a low-grade... I mean it very literally. I mean, what do you mean? It's like a low-grade ground beef you get at some of your major chains. Well, you're saying you can eradicate Ebola, because you can eradicate the... We're like incidental hosts.

Like it's in possums in the forest? It's actually, we now know it's in fruit bats. Most of the fruit bats, yeah. So you're saying we would have to vaccinate fruit bats as well as ourselves in order to get rid of Ebola? You would have to either eat all the fruit bats or eat all the humans and... And all get Ebola. You would have to

not eat all the fruit bats, murder them. Right. So malaria. Malaria is different. The malaria species that infect us only infect us and so theoretically we can get rid of it but we got 200 million people who die of that's two so 200 million people big number right wait wait yes i need for that to be rate there has to be a time unit in there so you want a time unit? 200 per... How about this?

747 jet crashing every minute and a half and it's all full of children. That's malaria. Okay, comedians, work with that. Well... Is there any way to get them to be teenagers? So, Mark. So, if an actual 747 crashed every 90 seconds in one day ever,

no one would travel and they'd ground all airplanes for the rest of the universe. Right. Yet this is going on with malaria, and what are we doing about it? Well, there are a lot of people doing a lot of things. And in fact, what's interesting... Can you only get it from a mosquito?

You get it from another human, and it's transmitted by a mosquito. So what's interesting is that it exists in places where people are infected and then other people get infected so mosquitoes are not the cause they're the vector what does that mean? can you get it from a person and a mosquito?

no the mosquito will bring it from one person to another but if you actually cure someone it's like a terrible train I'm not flying or taking the train so you another, but if you actually cure someone... It's like a terrible train. All right. I'm not flying or taking the train now. So you catch malaria from another person because the mosquito got it from the other person and brought it to you. Absolutely.

Whoa. Okay, so malaria we associate with the tropics. By the way, you must know this, back at the turn of the previous century, there was a big exhibit on malaria and mosquitoes brought about by all the effort to make the Panama Canal. And we have that huge model that's, I don't think it's on display, of this mosquito. It's like this big. Here's the funny thing.

In our museum, we've got a mosquito on display that's called a... It's this big? Yeah, yeah. It's a malaria mosquito. It's a male and the males don't feed on blood. Idiots. I knew that museum was wrong. Okay, so I never knew...

So I didn't know that. I mean, that's not as bad as The Daily Show having the planet go in the wrong way. Come on, man. Oh! Come on. It is literally worse.

They're a comedy show, and you're a science museum. But both can be corrected with money.