My high school physics project involved ballistics calculations for an acetylene cannon. Computers were less ubiquitous in 1984 than now, so I was rather proud of my stepwise integration program that predicted trajectory given the initial energy, incorporating drag forces. But to be sure, the experimental aspect was the most exciting part. Acetylene burns with a brilliant light, which is why I was able to simply hold the camera shutter open and get the launch photograph using only light from the cannon itself. I proudly showed the 8x10 print of that shot to my classmates, winning great accolades. Glory days.