Bernard Morin developed glaucoma at an early age and was blind by the time he was six years old. Despite his inability to see, Morin went on to become a master topologist—a mathematician who studies the intrinsic properties of geometric forms in space—and earned renown for his visualization of an inside-out sphere. For sighted people, […]

Elephants without tusks are a response to the selective pressure of poaching.

At the Hotel Parco dei Principi in Rome, in September of 1973, the Hungarian mathematician Paul Erdős approached his friend Richard Guy with a request. He said, “Guy, veel you have a coffee?” It cost a dollar, a small fortune to a professor of mathematics at the hinterland University of Calgary who was not much […]

Can you imagine a time before we dreamed about time travel? The idea of altering an unpleasant future disclosed by an oracle, and the associated paradoxes of Fate, have been with us for millennia; but before H.G. Wells’ The Time Traveller, in 1895, the concept of time travel was wispy and of very little cultural […]

Nearly a quarter of Americans still believe in Ptolemy’s idea that the sun goes around Earth. Yet, every year, these people presumably cheer on December 31 to mark the New Year, another successful trip of Earth around the sun. It’s likely not hypocrisy, just ignorance. But if much of the general public still doesn’t get […]

Dr. Hans Reiter achieved the one thing most likely to keep a physician’s name in textbooks forever: He got an illness named after him. While working as a medic in the German army in World War I, he once treated a case of simultaneous inflammation in the joints, eyes, and urethra. This became known as […]