We went over charging by friction, conduction, and induction today, and then it was time for the fun.
First, we did Fresca soda can races. Using a charge object, get a Fresca can from the start line to the finish line quickest without ever touching the cans. (Fresca cans seem to show charge separation better than all the other soda cans, for some reason. When I used to use lots of different types of cans, the team with the Fresca can always one.) It used to be that straws would work, but this year, rulers, rabbit fur, and styrofoam plates were used to accelerate the Fresca cans.
Then, we played with the van de Graaf machines. They weren't as much fun as usual; it was too humid in December in Ohio.