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Folding fractions

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.
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Who's looking at you?

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.
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Steady on, Einstein

To celebrate the release of more English translations of Einstein's papers, we revisit one of his previously unknown models of the Universe.
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From dust to us

Where planets are born is not necessarily where they will stay…
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Meet the hyperbola

It might not be as familiar as the circle or parabola, but it's definitely worth getting to know the hyperbola!