Obelisks served as solar symbols, astronomical tools, and royal monuments in ancient Egypt—and many still stand in city centers around the world today.
Mortality rates can be misleading without context. Learn what they actually measure, how they differ from case fatality rates, and how to interpret them accurately.
Most planets spin the same direction, but Venus and Uranus are exceptions. Here's why some worlds rotate backward and what that tells us about our solar system.