"Well, in my left hand I have a feather; in my right hand a hammer. I guess one of the reasons we got here today was because of a gentleman named Galileo, a long time ago, who made a rather significant discovery about falling objects in gravity fields – and we thought, where would be a better place to confirm his findings than on the Moon? […] I'll drop the two of them here and, hopefully, they'll hit the ground at the same time. … How about that? This proves that Mr. Galileo was correct…"
— Commander David Scott, Apollo 15 (1971)