Hippo Sunscreen

We just learned about how frogs breathe with their cheeks

Hippos live in the hot Southern part of the African continent.

With all that sun out there, they've got to keep from getting a sunburn,
and their bodies have a pretty cool way to do it.

From underneath a hippo's skin comes a type of gooey stuff called mucus,
and it comes out through their skin like sweat.

It's red colored, and it looks like sweat, so people sometimes call it blood sweat,
but it's really two kinds of acid that mix together in the hippo's body
and then come out through their skin like sweat.

This red gooey mucus acid stuff (called hipposudoric and norhipposudoric acid)
is the hippo's natural sunscreen!

It turns hard and it stays on their body even if they go in and out of the water.

(from: wikipedia - hippopotamus)

Wouldn't it be great if our body could make it's own sunscreen?

Pectorals

Let's keep learning about the muscles in the human body!

Last time we learned about the deltoids

Next up is the pectorals.

The pectorals, which are sometimes just called pecs
are used when you do pushups, when you clap your hands together, or flap your arms like wings.


(from: wikipedia - pectoralis major muscle)

Sweden

Let's keep learning about the countries in Europe!

Last time we learned about Norway,
and how Norway, Denmark and Sweden are all Scandinavian countries.
Sweden is also part of the Scandinavian Peninsula.


(from: wikipedia - sweden)

Swedish inventor Alfred Nobel invented dynamite, and started the Nobel peace prizes.

(from: wikipedia - alfred nobel)

Every year Sweden builds a hotel made of ice, big enough for 100 people.

(from: wikipedia - tourism in sweden)

The type of meal where you have a table full of food to choose from
is very often called a smorgasbord, which comes from the Swedish word Smörgåsbord.

(from: wikipedia - smörgåsbord

Jeremiah

Let's keep learning about the books of prophecy in the Old Testament.

Last time we learned about the prophet Isaiah.

Another prophet was named Jeremiah.
He is sometimes called the weeping prophet because he was so sad
that he had to tell God's people that because of their sins they were going
to have some difficult days ahead when their temples would be destroyed and they would be captured.


(from: wikipedia - jeremiah)

Stellar Classification

We just learned about Canopus.

Remember that stars in the sky like our Sun
are just giant balls of burning gas floating in outer space.

When scientists want to measure how hot a star is,
they use something called stellar classification.

The letters for stellar classification from hottest to coldest are:
O, B, A, F, G, K, M.

That can be tough to remember, so you can think of it with this sentence:
Oh Be A Fine Girl Kiss Me since those first letters all match up.

A stars heat usually makes it burn a type of color,
so each of the letters has a color that goes with it.

O - blue
B - blue white
A - white
F - yellow white
G - yellow
K - orange,
M - red

Scientists like to use the letters for how hot the star is,
but sometimes it's more fun to talk about a star by it's color!


(from: wikipedia - stellar classification)

French - Counting to Twenty

We just learned how to count to 15 in French, let's keep going!
16 seize - sounds like sez /?/
17 dix-sept - sounds like dee-set /?/
18 dix-huit - sounds like dee-zoo-ee /?/
19 dix-neuf - sounds like dee-nef /?/
20 vingt - sounds like vah-un/?/

Semiconductor

We've learned about how conductivity means how fast electricity goes through something,
and that metal is a good conductor, but rubber is a bad one, also known as a resistor.

What about things that are kind of good conductors?
We call those semiconductors.

One of the most common semiconductors out there is a chemical called silicon.

(from: wikipedia - semiconductor)