My father was a scientist. He was the astronomer and educator Carl Sagan. Science wasn’t just his occupation, it was the source of his worldview, his philosophy, his guiding principles. He and my mom, writer and producer Ann Druyan, taught me that belief requires evidence. They taught me that science wasn’t just a set of facts to be compared and contrasted with other philosophies but a way of testing ideas to see which ones stand up to scrutiny. They taught me that what scientists think today might be disproven tomorrow, and that’s wonderful, because that’s the pathway to a better, deeper
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