7:59

What is a black hole?

6:28

What causes the Northern Lights?

5:46

Is Pluto a planet?

7:20

What's the deepest hole anyone has ever dug?

6:29

How can you tell if a plant is poisonous?

5:42

How are diamonds made?

8:06

What's the best place to look for dinosaur fossils?

8:33

Why does the moon turn blood red during a lunar eclipse?