How to do TEN TIMES more coronavirus tests, for free

‘Test pooling’ could transform coronavirus testing—so why is no-one doing it?

My favourite optical illusion

This optical illusion is so cool I just had to make a video about it.

How to see Comet NEOWISE

My new video on the beautiful, fleeting visitor to the inner Solar System.

Coronavirus: what the hell do we do now?

A transcript of my recent video about the what happens next with coronavirus—just in case 30 minutes of me talking isn’t for you!

Coronavirus: what happens next?

Check out my new video about how to beat COVID-19.

Invisible London

London, as you’ve never seen it before: a tour of the capital in infrared.

Mobile phone microscope

Want to turn your phone camera into a surprisingly powerful macro machine? Just add water… Watch the video to find out how.