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As well as being the 150th since Maxwell's equations, this year, and in some senses today, the 25th November, is the centenary of Einstein's General Relativity - although as many
physicists will point out, that statement depends upon your space-time reference frame (as we all saw in the film Interstellar, observers in different gravitational fields will disagree on
elapsed time, as the theory itself predicted) and, as many historians of science will point out, there are other dates one could pick. But it was definitely about now as far as we are
concerned on Earth, and the previous sentence was long enough already. The video above, narrated by David Tennant, seemed like a fun summary to me, and if you want to know more, there is for
instance this lecture. _Jon Butterworth's book __Smashing Physics__ __is available as "Most Wanted Particle_"_ in Canada & the US and was shortlisted for the Royal
Society Winton Prize for Science Books._
