People are intrigued by Einstein's Special Theory of Relativity. They are fascinated by the Twin Paradox and the slowing down of moving clocks. However it is often forgotten that Einstein's SR, in spite of being weird to the day to day speeds we are accustomed to, saved Physics from something worse. In other words if you think SR is strange, imagine a universe without slowing down of moving clocks: Suppose a pair of twins 20 years old. One travels at near the speed of light for 60 earth years on a round trip. Upon return they are both 80 earth years old-balding, wrinkles, fewer teeth. In 1870 physicists would say so what; time travels at the same rate for everybody. However,if moving clocks did not slow down, if both twin brothers ended up 80 years old, what would the great disaster that would occur to physics?