Wow -- I found great demonstrations for teaching nuclear concepts. The site had creative ideas where the teacher could stick hundreds of matches next to each other,tie mousetraps together with string, make a domino chain, etc. All really good stuff.
But check out the sketchy assignment near the end of the unit:
This was actually posted on my professional organization site, the National Science Teachers Association (NSTA). I think parents and principals would not dig this assignment too much.