Everything's on sale!  Everything. Must. Go.  All prizes are 40% off, 60%, 90%!  Wait, what's that?  Oh, there's nothing left.  Wait, looters?!  What?  I don't know what's happening.  Well, Sandra and Daniel, you're definitely still getting the autographed cards from the final round of the show, and the person who ends up with the most points will get the commemorative 'I Won SciShow Quiz Show' pin.  It's made of metal.  But the biggest loser of the show will get the last, final, and the rarest of the rare pins, because it's the last ever 'I Lost SciShow Quiz Show' pin.  Well, I guess this is it.  Comin' at you from the Prize Zone, this is Stefan Chin, signing off.

B: Okay, I'm going to start you each off with 1,000 points.  Each time you get a correct answer, you will gain points.  If you give a wrong answer, you will lose points.

H: Yes.

B: Do you follow that?

H: Yes.

(?~2:47)

M: As arbitrary as ever.

B: So without further ado, let's jump into our first round, looks can be deceiving.  

H: Okay.

B: This is a picture round, so all our answers will be based on images.  You ready? 

H: Mhmm.

B: Plants and animals come in a dizzying variety of colors.  In many cases, these colors are based on pigments.  Anthocyanins, for example, are pigments that give plants vibrant chains of red, purple, and blue, but it's purple we're interested in today, because my question to you is, which of the following four purple fruits or vegetables does not actually exist?  Is it A: the tomato, B: the cauliflower, C: the strawberry, or D: the lime?

H: Ooh, a purple lime.  Oh, I forgot we had to buzz in.  

M: I'm gonna say D.  

B: No, sorry.

H: I'm glad, yeah, I'm glad you said D because I wasn't gonna say D, but--

M: Then why are you glad I said D?

H: 'Cause so you lost points.  I'm gonna say C, that strawberry looks fake to me.

B: That is correct.

H: Ehh!  

B: I don't understand the answers to these things, but I have a  colleague who does, so here's Smart Blake to explain the answer.

Thank you, Dumb Blake.  Anthocyanins aren't just pigments, they're also antioxidants, meaning that they can help wrangle charged free radicals that can cause harm to cells.

Now some people think that foods high in anthocyanins are especially good for you, like that purple cauliflower, but the science behind that claim isn't exactly solid.  Nonetheless, scientists have found ways to get more of these molecules into foods that normally don't have them, which is where those blue tomatoes and purple limes come from.  Garden-variety tomatoes don't usually have anythocyanins in the fruits themselves, but some wild varieties do, so with careful pollenating and selective breeding, researchers have been able to produce tomato plants that make purple fruits and most limes don't produce anthocyanins naturally, so to get purple ones, researchers have given Mexican limes the genes from grapes and blood oranges, which sounds rather delicious.  As for strawberries, they do contain anthocyanins, but not enough for the bluer ones to make the berries look purple, and so far, as far as we know, no one has tried to breed or engineer purple strawberries.  Back to you, dumb Blake.

M: I'm glad you won the points, Hank.

H: Oh, hey, thank you.  Yeah.

B: So there might not be purple strawberries yet, but I am all about their development because they look delicious.  Let me redirect the conversation slightly and let's talk about cockroaches.  There are over 7500 species in the order Blattodea.

H: Blattodea?

B: Which I think is hilarious because you know whoever named the cockroaches were like, you're looking at cockroaches?  And they're like, blaaaah todea.  

H: Yeah.

B: We'll just say it means something in Greek.  Anyway, Blattodea is the order that includes cockroaches and they're incredibly diverse.  Some are even downright beautiful.  

H: I had no idea.  I thought cockroaches were one species.  

B: You would think, right?

H: But there's a bunch of different cockroaches.  This is amazing news.  I mean, probably not amazing for everybody.  I'm excited, though.

B: I am, too.  I mean, as far as I can get excited about cockroaches, I guess.

H: Yeah, right, right.  

B: Which of the following is not one of those cockroach species?  

H: Oh, okay.  We've got pictures.  

B: So is it A: the red stripedy one, B: this noble bug, C: this spotted beauty, D: this large-winged bug, E: this glowing beast, or F: this little blue beauty?

H: Okay.  Boy, oh, boy, they all are staggering variety.