I worked the Color presentation for Physics. First, we used diffraction glasses to teach the children about breaking white light into the entire spectrum of light. The kids got to keep the glasses, so they loved that. Then, we used tops to demonstrate the mixing of colors. Finally, we did a retinal fatigue exercise.
Our audiences were groups of second, third, and fifth graders. We've never done the presentations for children as old as fifth graders before, so it was a different experience. Some of the children asked really good questions - one boy asked about how different colors were made.
Overall, the day was absolutely exhausting. I could hardly speak by the end of it.
The school plans to continue the program annually, visiting a different school each time. Personally, I think it's a really cool way to reach out to other schools, and to teach kids about science.