Just over four hundred years ago, in 1610, Galileo published the Siderius nuncius, or Starry Messenger, a 'hurried little masterpiece' in John Heilbron's words. Presenting to the world his remarkable observations using the recently invented telescope - of the craters of the moon, and the satellites [...]

In this moving and eloquent portrait, John Heilbron describes how the founder of quantum theory rose to the pinnacle of German science. With great understanding, he shows how Max Planck suffered morally and intellectually as his lifelong habit of service to his country and to physics was confronted [...]