Special Theory of Relativity 1234Einstein, in the special theory of relativity, proved that different observers, in different states of motion see different realities. Leonard Susskind When you are courting a nice girl an hour seems like a second.When you sit on a red hot cinder a second seems like an hour.That's relativity! Albert Einstein Lesson Videos Moving Clock Sim Time dilation Length Contraction Sim Time Dilation Sim Muons and Special Relativity. Quizes Special Relativity Practice Sheets Special Relativity Practice Blank Note