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Bob Wald tells us why probabilities are important in cosmology.

If you roll a parabola along a straight line then the shape its focus traces out as it goes is ... a catenary!

John D. Barrow tells us how to get the best view!

How to derive the famous quadratic formula from pictures, just like the Babylonians did.

Five basic facts from the father of geometry.

The complex maths of weather and climate.

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