Thought for the day

It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, and comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows the great enthusiasms, the great devotions; who spends himself in a worthy cause; who as the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who know neither victory nor defeat. [Theodore Roosevelt]

Tuesday, February 22, 2011

Einstein's Twin Paradox

Einstein’s famous Twin Paradox in which a twin makes a journey into space in a high-speed rocket and returns home to find he has aged less than his identical twin who stayed on Earth is a mind boggling concept at first glance.  This clever animation produced by Yuanjian Luo interprets the theory in a way that makes it easier to understand, even for those of us who have never heard of time dilation or nonequivalent reference frames.

A Tale of Two Twins from Yuanjian Luo on Vimeo.


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