@wilbowma @shriramk @maxsnew @yforster This reminds me of a beloved lab from my HS physics class. We all had to build our own tennis-ball cannons out of physical-therapy elastic tubing + PVC, and then experimentally calibrate a model for the ballistic trajectory at different launch angles. Then teacher would take us outside, place a 5 gallon bucket, tell us how far away it was, and subtract 10 points for every shot after the first. Median grade was an A.