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Mysterious number 6174

6174 is a very mysterious number. Yutaka Nishiyama explains why, and how beautiful mathematical oddities can inspire us to discover new mathematics.
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Graphical methods I: Slug wars

To arm or to disarm? This is the question in Phil Wilson's article, which explores the maths behind a cold war in slug world.
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Anything but square: from magic squares to Sudoku

Get on a commuter train these days and you can virtually see people's brains crunching away at filling the numbers from 1 to 9 into a square grid. As the Sudoku craze shows no sign of slowing, Hardeep Aiden investigates its relatives and predecessors.
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Editorial

  • What motivates mathematics?
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Symmetry rules

Everyone knows what symmetry is, and the ability to spot it seems to be hard-wired into our brains. Mario Livio explains how not only shapes, but also laws of nature can be symmetrical, and how this aids our understanding of the universe.