What were the problems in classical physics that einstein solved?
Think of a train going 60 mph with a glass boxcar you can look into. There is a baseball pitcher throwing a balls from one end to the other at 90 mph. You are outside on the ground watching. To the pitcher the balls are going 90 mph. To you the balls are going 60 + 90 or 150 mph. Are we still together? Now it gets interesting. When scientists started figuring out the speed of light a weird thing happened. Both the scientist on the train and the scientist on the ground observed that light was traveling the same speed. This was a very strange result and scientists spent many years trying to figure out how this could be. It just did not make sense. Finally Einstein saw that the way out of the problem was IF time and space shrank and expanded with the speed of the observer such that all observers would see light traveling at the same speed. This made time, space, matter, and energy relative to the speed of the observer and the speed of light absolute. Turns out that this really weird idea
