Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

You use your credit card on a regular basis to make purchases. While most people know that the numbers on the card are unique identifiers, most of us have no idea what they actually mean. Credit card ...

Luke Durant was folding his laundry right into his suitcase ahead of a trip back home to Alabama when he decided to check his computer and see if he had made history. He figured that, like every other ...