Students at St Leonard's College in Brighton saw the Naked Scientist Chris Smith live as he recorded a podcast before their very eyes.

Joined by local scientists and space enthusiasts Chris Smith kept the students entertained with flaming gherkins, floating hot air balloons and showed them how to use a microwave, white bread and lots of margarine to calculate the speed of light.

Check out Naked Scientist podcasts at: http://www.thenakedscientists.com/HTML/podcasts/