A heavy stone is pulled towards the earth more strongly than a light one, which suggests that it ou to arr first. I does n, because t same ma that incr the pu also incr the resis to being moved, and the two effects cancel exactly. The reason a feather loses is air, not weight. Remove the air and the feather and the stone reach the ground together, which is a result that people found impossible to believe for two thousand years.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.