Did you know that there's so much empty space inside matter that the entire human race could be squeezed into the volume of a sugar cube? Or that you grow old more quickly on the top floor of a building than on the ground floor?

The two towering achievements of modern physics are quantum theory and Einstein's general theory of relativity. But, almost a century after their advent, most people haven't the slightest clue what either is about. Get set for the most entertaining science book of the year.