The concept of a speed limit seems a simple one - until you think what can happen when a speed camera clocks a rotating wheel...
Following on from his article 'The prime number lottery' in last issue of Plus, Marcus du Sautoy continues his exploration of the greatest unsolved problem of mathematics: The Riemann Hypothesis.
In 1997 Garry Kasparov, then World Champion, lost an entire chess match to the IBM supercomputer Deep Blue, and it is only a matter of time before the machines become absolutely unbeatable. But the human brain, as Lewis Dartnell explains, is still able to put up a good fight by exploiting computers' weaknesses.
  • What is maths for? - What do we hope people will know after studying maths at school?
  • New Plus posters! - Find out how you can get hold of your own copy of our brilliant new poster!
  • Specially for students - This issue of Plus brings you the first of an occasional series expecially for use in the classroom.
Human beings are famously prone to error, and proof-readers are, after all, only human. But who picks up the errors a proof-reader misses? John D. Barrow challenges readers to estimate the errors that aren't found from the errors that are.