Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

For the past year I have been working with Britain’s BBC television to make a documentary series on the history of women. In the latest round of filming there was an incident that haunts me. It took ...

For several hundred years, millions of Chinese girls had their bodies painfully misshapen to conform to a prevailing social expectation. Intact feet, girls were told, would damage their marriage ...