You know from Galileo’s experiment that falling objects will fall at the same speed, no matter their weight. The experiment falls apart when you use feathers, however, because they waft down rather than fall, because of air resistance. But what if you took the air out of the equation?
The world’s largest vacuum chamber is in Cleveland, Ohio. Physicist Brian Cox visited to show us what a falling feather looks like in an environment without any air, so therefore no air resistance. The clip is from the BBC Two show Human Universe. -via Metafilter
Either I strongly disagree with his interpretation of what relativity is saying, or he said it very poorly. While a key part of general relativity is that the effects of gravity and acceleration are indistinguishable from a closed box, it doesn't change that objects will still fall toward the Earth.