And now it's time for who smarted.

Pse, hey, Smootie Pants, I bet most of you can guess that sound.

Now, which of these would you associate that sound with?

Hot or coal?

Why, of course, coal.

Now, close your eyes and picture a time when you might hear such cold wind.

Did you say winter?

Great! Now, close your eyes and picture the scene. What do you

see? Maybe snow, sleet, ice or icicles, or even a polar bear? Or a penguin. Wow, this wind is really

something. Burr, getting shivers just thinking about it. Where do you think you'd have to go

for it to be this windy and cold? Did you say Antarctica? Great guess. The North Pole isn't a bad

guess either. Neither is Cleveland. Oh, me cold. Right, my caveman friend. Smarty pants, instead of winter and Antarctica,

imagine, if you will, this kind of weather all year long

and everywhere on Earth.

That's right.

It's happened before.

About two billion years ago,

our planet was completely frozen over,

making it one giant snowball.

Hey!

Gotcha! Snowball fight!

Uh, maybe later?

...