Here's a technique for allowing kids to try new ideas in a risk-free setting. I have my students write an idea on a paper without putting down their name. Then I ask them to pass their paper around without leaving their seat. The students love the frenzy as the papers are passed from one to another. When I say stop, the students keep the paper that is in front of them. Then, I call on random students for the answer on their paper. No one is embarrassed even if the answer is off-base because only the author knows who wrote the answer.