The Similarities Between Seashells, Spiral Galaxies, and the Human Heart
Photograph Source: Amada44 – CC BY 3.0 One halcyon spring day in 1903, the 69-year-old anatomist and naturalist Dr. James Bell Pettigrew sat at the top of a sloping street on the outskirts of St. Andrews, Scotland, perched inside a petrol-powered airplane of his own design. Over the course of 40 years, ever since he…
