My first foray into TV came in 2003 when I presented Inside Out Brazil, a five part BBC series about Brazilian art and culture. I also made two programmes about the Amazon, which I have linked to at the bottom of this page.
By the time I moved in to science popularization, YouTube had become an important part of the landscape. I have contributed to Numberphile - presenting its most viewed clip, a way of cutting a cake that I written about in Alex's Adventures in Numberland - and also produced my own videos. A selection are below.
I have written and presented documentaries about maths on BBC Radio 4, and have also appeared on various programmes including The Infinite Monkey Cage, the Museum of Curiosity, More or Less and Today.
Land of the rising sums
Why is it that Asian children perform better in international rankings of school maths ability than Western kids do? I travel to the All Japan Abacus Championship in Kyoto to find out and see one of the most incredible feats of mental arithmetic ever performed.
Nirvana by numbers
The number zero was invented in India one and half thousand years ago. I travel to India to investigate the links between this mathematical invention and the spiritual idea of nothingness. I sit with a guru in his temple and find the earliest zero written in stone.
Shortlisted for best radio programme in the 2014 Association of British Science Writers Awards.
How to teach maths
I investigate how UK primary mathematics has changed in the last few decades, and the science – and politics – behind the changes. I explain new techniques like chunking and grid multiplication that leave many parents confused.