6:48

How do braces work?

6:17

How do erasers erase?

6:45

Is the five-second rule true?

6:34

Why do we have tears when we cry?

7:50

What's the most dangerous animal in the ocean?

7:16

Who invented the high five?

7:54

What would happen if you didn't have a skull?

6:52

How do vaccines work?