[math-fun] More 4th Grade Science

<Photo of Apollo astronaut about about 1ft above the lunar surface, resembling those bad photoshops of Chinese officials floating above recently opened highways> "On the moon, an astronaut can jump higher than on Earth. Is this fact or opinion?" Assuming that cumbersome spacesuits and safety concerns prevented anyone from actually trying this, how can we call it fact? "Fact" means "done". So isn't it still simply a very believable opinion? --rwg