Reimagining time: a light-speed tour of Einstein's theory of relativity

Light goes at one speed

So time has to be relative

As does simultaneity, which means lengths must contract with motion

By a very particular amount

Revealing the exchange rate between energy and mass (E=mc2)

Bonus feature : the chicken or the egg? : a take on Einstein's twin paradox

Geek notes : for the skeptical relativist.