Yvonne Choquet-Bruhat obituary: mathematician who established that Einstein’s equations mirror the real world Pioneer of general relativity and gravitational-wave theories saw her work confirmed ...

This means they are made of both real numbers and the imaginary number i: the square root of negative 1. Remember, a square root of a number represents a number whose square is the original number.

The popular concept has been depicted in everything from film to social media testimonials, but the real science behind the butterfly effect can help scientists predict the future.