Name: SciShow Quiz Show: Jessi Knudsen Castañeda
Uploaded: 2014-06-17T03:20:46.000Z
Duration: 13 min 10 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Ladies and gentlemen, boys and girls, welcome to SciShow Quiz Show, the show where these

two people will compete in sciency knowledge things and win prizes for Subbable subscribers.

Hank: Is there going to be applause there? *laughter all around*

Michael: And we have host of Animal Wonders Jessi Knudsen Castaneda!

Michael: Hank, you will be competing on the behalf of Josh Beel.

Hank: Josh, I got your back! Michael: Jessi, you've got Max Loutzenheiser.

Jessi: MAAXX, let's go! Michael: To find out how our contestants can

play for you, go to subbable.com/scishow Hank: It's almost like this isn't even doing

(laughter) Michael: Sorry, Tim! You're in the splash

Michael: Okay, both of you start out with 1000 points, and every time you answer a question

correctly, you will win some number of points that I will make up in that moment!

Jessi: Alright! Hank: If we get it wrong though, what happens?

Michael: If you get it wrong, you will lose some points or something.

Michael: Whoever has the most points at the end of the game will win DFTBA merchandise.

Stefan, what can they win? Stefan: Well, Michael, our contestants today

can win a Pizza John Frisbee or this Pizza John notebook. Write little notes about pizza

Michael: Okay. *laughing* *cough* You guys ready?

Hank: Oh, we're going to start. Jessi: No...Yes. No!

Hank: This is pretty nervous. Honestly, does make me nervous.

Michael: Round One! Our topic is human evolution. Jessi: Oooohhhhh...

Hank: Okay, but how do we, hit the thing, do we...

Michael: Yeah, you hit the thing. This is a game show. You gotta hit the thing.

Jessi: It's like Slapjack? Hank: And then- and then- stop that's loud.

So we're trying to beat the other person to the buzzer?

Michael: Yeah. Hank: Or is it multiple choice?

Michael: It's multiple choice- Hank: Okay, see this is the thing-

Jessi: But can we answer before the multiple choice?

Michael: You can answer whenever you want to.

Hank: What's your answer? Jessi: No! Wait!

Michael: It is known that Homo sapiens spent a lot of quality time with other human species,

particularly Homo neanderthalensis, whose genes account for about 2% of the DNA in most

modern humans. But which of these other human species did not coexist with other humans?

And we're only talking about species that lived at the same time as anatomically modern

Hank: Homo HABilis. Michael: *Bleep* Was it:

Hank: A, Homo habilis. Michael: You are correct!

Hank: I don't need to hear the other ones! You said I could answer any time!

*Laughing* Michael: Okay, you got a hundred points and

you've lost a hundred points. Yay! Jessi: Wait, I lose? I lose?

Michael: The Denisovans, or Denisova hominins, were a human subspecies that lived as recently

as 40,000 years ago in eastern Asia, and they too appear to have bred with modern humans,

as shown in the fact that some people living today in Southeast Asia and the Pacific Islands

have been found to have about 5% Denisovan DNA. The great rages on about the hobbits

meanwhile whose remains were first discovered on the Indonesian island of Flores in 2003.

They were barely more than a meter tall, and some had unique skeletal features in their

wrists and feet, so some scientists maintain that they were a genetically distinct species

while others believe they were modern humans that exhibited the phenomenon of island dwarfism.

And the jury's still out about whether we shared the planet with other older members

of the genus Homo like Homo erectus, but most scientists agree that Homo habilis was the

earliest member of the genus and had the most ape-like features. They vanished about 1.5

million years ago, 1.3 million years before the first anatomically modern humans.

Michael: Our second segment this week is all about geology, the study of Earth's physical

structure. We like to call it school of rock. Hehehe. Our first question in School of Rock

is about the difference between rock and minerals. A mineral is defined as a naturally occurring

inorganic substance with a specific chemical formula and a crystalline structure. Rocks

are aggregates of more than one mineral. So, with that in mind, which of the following

is a mineral and not a rock? Is it: A) Limestone

Jessi: Crap. Hank: *laughing* You hit the button!

Jessi: I know! I got excited! I'm going to say...C) diamond.

Michael: You are correct! Jessi: Yesss! Yes!

Hank: That's also what I would have said. I'm not allowed to dance around because I

Michael: Diamond is considered a mineral and not a rock because it's a crystalline arrangement

of one chemical compound, in this case, pure carbon. Limestone, on the other hand, is mostly

made of the mineral calcite, also known as calcium carbonate, but it also contains some

small amounts of clay and silt and other stuff too. Obsidian is a volcanic glass; it's not

a crystal, which has molecules arranged in a rigid structure. Instead, it's what's called

an amorphous solid because it's particles are organized all randomly. And chalk is just

another form of limestone, and aggregate of calcium carbonate, silt, and clay.

Michael: Okay, you've got two hundred points, you've lost-

Hank: I lost- Just because I didn't answer, I lose money. God- points.

Michael: Fifty points. Hank: Oh, I only lost fifty points.

Michael: Okay, next question in School of Rock.

Hank: Oh, there's more than one question in School of Rock.

Michael: The density of rock is often expressed as a specific gravity--The weight of a sample

of rock compared to the weight of the same volume of water. For example, the density

of water is 1 gram per cubic centimeter, while the density of granite is 2.6 grams per cubic

centimeter. Now, there's only one kind of rock that's less dense than water, and can

*Laughing* Hank: She got it right. It didn't light up.

Hank: Oh man. Michael: Two hundred points to Jessi.

Jessi: My brother did that. It was awesome. Hank: I did not know that. Gah! Do I lose

more points now? Michael: Another fifty points from Hank.

Hank: Oh my goodness. Michael: Wromp wromp wromp...

Michael: Pumice is the only type of rock that can float. It has a density of about 0.5 grams