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Ian Stewart
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Entries by Ian Stewart

Hearing the Shape of a Room

(13) Comments | Posted June 27, 2013 | 9:00 AM

Our senses work by turning features of the outside world into signals, which are processed by the nervous system and brain to build a mental model of reality. Humans rely heavily on vision. Dogs have a fantastic sense of smell. Cats use their whiskers -- touch. Sharks pick up electrical...

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Math Was Right

(8) Comments | Posted March 25, 2013 | 2:45 PM

It is now 60 years since Francis Crick and James Watson worked out the molecular structure of DNA, with vital input from Rosalind Franklin and Maurice Wilkins. Their discovery that DNA encodes genetic information, in a form that can be copied by purely chemical processes, began the molecular revolution in...

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Great Mathematical Problems

(3) Comments | Posted January 28, 2013 | 5:17 PM

Mathematicians have always been fascinated by the great problems of their subject, the deep and difficult questions that they would give their right arm to answer. Some have been puzzling us for thousands of years; others have been around for only a few decades. Some are questions that anyone can...

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