
Radioactivity also gave the history of life an absolute calendar. By measuring the atoms produced by these breakdowns inside rocks, physicists were able to estimate their ages and by comparing the ratios of those atoms to atoms from meteorites, they could estimate how long ago it was that the Earth formed along with the rest of the solar system. In 1956 the American geologist
Claire Patterson announced that the Earth was 4.5 billion years old. Darwin had finally gotten the luxury of time he had craved.
Ipsa scientia potestas est. ~ Knowledge itself is power.----