These are the videos at http://spaceflight.nasa.gov/brainbite/home.html
What's a launch window?
What time is it in space?
How would you turn a bolt in space?
What's the vomit comet?
How long would a round trip to Mars take?
How do you go to the bathroom in space?
How can you gross-out your friends with a spacesuit?
How do you scratch your nose in a spacesuit?
Why do astronauts practice underwater?
What does the vacuum of space look like?
Why do we only see one side of the Moon?
Should you pull over when an astronaut floats by?
How long does it take to call Mars?
How can I see the Space Station?
Would you hear a spaceship fly by?