[MindYourDecisions] presents a Babylonian tablet dating back to around 1800 BC that shows that the hypotenuse of a unit square is the square root of two or 1.41421. How did they know that?

Mathematicians once turned up their noses at imaginary numbers. But complex analysis actually simplifies math and physics.

I'm a mathematician who studies analysis: an area of math that deals with complex numbers. Unlike the more familiar real numbers—positive and negative integers, fractions, square roots ...