Lesson 1: Relativity  What is it?
Note: For Fermilab's Time Dilation Challenge and The Relativity Game, you need Shockwave. You may painlessly Download Shockwave here if you do not have it.Lesson 2: Time Dilation
Lesson 3 : Relativistic Mass
Lesson 4 : Length Contraction

Where does that come from? Let's consider a hugh clock 300,000,000 meters high (obviously not drawn to scale below). A light pulse goes down and up on the clock reflecting off mirrors on the bottom and top of the clock. We are going to consider the clock while the light clock itself moves to the right with a velocity of 150,000,000 m/s. The mover will see himself as stationary and will see the light pulse go straight down and straight up. The stationary observer will see the clock move down and to the right. Because of the postulate that light travels at a constant speed, the time observed for the light pulse to travel down to an observer riding with the clock (the mover for the mover) would be different that the time measured for the pulse to travel down and over as measured by an outsided frame (the stationary frame for the mover). Tell me more about these light clocks...I just don't quite follow. I'm ready, Show me the derivation of the time equation that predicts the times as measured by these two different frames. Lesson 2: Time Dilation
