Bursting Bubbles, Counting Calories and Falling to Earth!

Chris Smith

In this week's Ask the Naked Scientists Dr Chris counts calories to find out how many we burn during exercise, works out how best to lose weight the healthy way, and finds out why astronauts aren't pulled back to earth from orbit.

Also coming out in the wash is why coloured bubble bath nonetheless produces white bubbles, whether removing salt from the ocean could reduce our chances of flooding and whether animals know about natural disasters before we do!