Fast-forward about 3-4 weeks and he came up with 4 amazing experiments to teach the kids about specific gravity, stages of matter, surface tension and conservation of mass (this experiment was shelved until next year due to time constraints).
Here he is a few nights before practicing his dry-ice/sublimation routine:
Yesterday afternoon we received this super-sweet e-mail from RJ's teacher that literally brought tears to my eyes:
Thanks so much for joining in on Science Day! The kids had a blast with your experiments, and I'm sure you noticed how RJ shined with love and pride. You're excellent at translating complicated concepts into familiar material that the kids could really grasp. Here's a few photos from our time with you. Please come by with more dangerous scientific materials any time! "
I am a very proud wife...today ;)