How Ancient Greeks Knew the Earth’s Size

The video below is a great strange little lesson in science history and human ingenuity. Having brains that instinctively build models and extrapolate from those models has been one secret of our species’ great success. Carl Segan explains how the ancient Greeks knew the earth was round and also it’s appropriate size thousands of years ago. – Truestrange.com Continue reading How Ancient Greeks Knew the Earth’s Size