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Photo of Eddington

Time to go retro

A model of backward causation in which the future affects the past could help unite quantum mechanics and general relativity – and satisfy a challenge thrown down almost a century ago by Arthur Eddington.

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The cosmic family tree

Mapping the ancestral history of spacetime in an effort to unite quantum mechanics and general relativity.
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Is gravity time's archer?

A new model argues the forces between particles in the early universe loosed time’s arrow, creating temporal order from chaos.
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The 36 officers problem

Euler may not have cracked this problem completely, but it led to a lot of important work, including on what we today know as sudoku.
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The knight's tour

Can you move a knight on a chessboard so that it visits every square exactly once? Euler was one of the first to analyse this problem systematically, but some questions about it are still open today.
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Bridges of Königsberg

The bridges of Königsberg

Can you find a path through on this city map that crosses every bridge exactly once? Euler's answer to this problem started off the filed of graph theory.

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Go Rio!

Here's a selection of our favourite articles on Olympic maths — from dressage, via ping pong, to athletics.
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Primes without 7s

James Maynard, one of the prize winners at the European Congress of Mathematics 2016, is counting primes that don't have 7s in them. But why?