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Author: Rachel Thomas
Folding a piece of paper in half might be easy, but what about into thirds, fifths, or thirteenths? Here is a simple and exact way for fold any fraction, all thanks to the maths of triangles. 

Observers are, of course, vital in physics: we test our theories by comparing them to our observations. But in cosmology, as Jim Hartle explains, we could be one of many possible observers in the Universe and knowing which one we are is vital in testing our theories. 

To celebrate the release of more English translations of Einstein's papers, we revisit one of his previously unknown models of the Universe. 
Anything involving bunny rabbits has to be good. 
How to write down unimaginably large numbers using just a few symbols. 
