Hey. I've never formally taken a physics class but when I read the blurb on Brian Greene's The Fabric of the Cosmos it intrigued me and I bought it. I started reading it the other day and there's one particular idea that I'm confused by, and which I hope you all could clarify. Greene references how Galileo said that if you are in a boat and you hold a coin over your foot and drop it, it will land on your foot whether or not the boat is in motion. When I first read this it made sense because from both your frame of reference and the coins the only thing in motion is the water (when the boat is moving, that is). However, I later thought, when you let go of the coin, in its frame of reference the water is no longer moving towards the boat, but the boat is moving towards the water, correct? Obviously the boat couldn't move forward very much in the time it takes the penny to fall, but if you were to perform the same experiment dropping the penny from, say, 100 feet in the air, would it still land on your foot, or land behind you? Thanks!