The ten most beautiful experiments

George Johnson tells the stories of ten beautiful experiments which changed the world.

From Galileo singing to mark time as he measured the pull of gravity and Newton carefully inserting a needle behind his own eye, to Joule packing a thermometer on his honeymoon to take the temperature of waterfalls and Michelson recovering from a dark depression to discover that light moves at the same speed in every direction - these ten dedicated men employed diamonds, dogs, frogs and even their own bodies as they worked to discover the laws of nature and of the universe.