Despite the widespread belief that natural is better when it comes to sex, pregnancy, and parenting, most of us have no idea what “natural” really means; the origins of our reproductive lives remain a mystery. Why are a quarter of a billion...
Why do compass needles point north―but not quite north? What guides the migration of birds, whales, and fish across the world’s oceans? How is Earth able to sustain life under an onslaught of solar wind and cosmic radiation? For centuries, the...