It takes some thinking, but it's a lot of fun. I was first interested in science when I was 9 - 10 years old. That was when we first started to send spacecraft around the earth. We used to go in the back yard and watch it fly over. Chris, It would depend on what the problem was.
Some programs can take different input, or be told to ignore some input.
On the Space Shuttle, to be safe, we carry five different computers. So the chances of something going wrong with all five is pretty small. I am in 3rd grade and science is my favorite thing in school. Marc, Fluids are like water, or air. Solids hold their shape, but a fluid will take the shape of its container.