2-Day Exclusive. Take up to £10 off. Get the code »

Len Fisher

Len Fisher is the author of "The Perfect Swarm," "Rock, Paper, Scissors," "Weighing the Soul," and "How to Dunk a Doughnut," which was named Best Popular Science Book of the year by the American Institute of Physics. He has been featured in "Newsweek," the "Washington Post," and "Scientific American." His website is: www.lenfisherscience.com