Across ancient civilizations, pyramids appear in places that never contacted each other, from Egypt to the Americas. The ...

It was the primitive pyramid that caught my eye. I wondered what this construct — it looked like a child’s version of an Egyptian structure sculpted in some dark, pebbly Play-Doh — was doing in a ...

Ancient civilizations that never contacted each other somehow built near-identical pyramids. The reason is surprisingly simple. The pyramid shape is one of the strongest ways to build something tall ...