We tend to think of facts like concrete, a solid foundation. They aren’t. Facts are fluid because our knowledge is always growing and expanding.

“Facts change all the time. Smoking has gone from doctor-recommended to deadly. We used to think the Earth was the center of the universe and that Pluto was a planet. For decades we were convinced that the brontosaurus was a real dinosaur.”

- The Half-Life of Facts: Why Everything We Know Has an Expiration Date by Samuel Arbesman