There was no science before 1572, the year that Tycho Brahe saw a new star in the night sky above him. To be sure, the Greeks had made efforts to present their knowledge of nature in a systematic fashion, but they lacked the tools — more specifically they lacked the ways of thinking — that have allowed investigators over the past 300 years to question the traditions that have preceded them, to probe the inner workings of nature, and in so doing to build increasingly informative accounts of the world that surrounds us.