I’m not a scientist, and I didn’t sleep at a Holiday Inn Express last night so I won’t pretend that I fully understand this let alone explain it. It’s cool to see a feather and a bowling ball dropping at the same speed and a lot of work went into filming this science clip. Galileo hypothesized in the 15th century that an object falling to earth falls at the same rate of speed/time and used a cannonball and a feather as an example. He had difficulty explaining it for obvious reasons but it turns out Galileo was a pretty smart dude.