21st Century Explorer : today's knowledge for tomorrow's explorer

The 21st Century Explorer is a 3rd-5th grade program that uses the Web, animation, and video to introduce to science, technology, engineering, mathematics, and NASA space exploration concepts. Questions below can be investigated:
Are we there yet?
Why return to the moon before going to Mars?
Why do astronauts eat tortillas instead of bread?
Why do we want to study and travel to Mars?
How would your body change in space?
Where would a space explorer find water and oxygen?
How can we travel faster in space?
What would you find on the moon’s surface?
What will replace the space shuttle?
What would you hear in a weather report from Mars?
Why do robots travel places before people?
How will your imagination help you become an explorer?