I have two children, one of whom is a son born on a Tuesday. What is the probability that I have two boys? Gary Foshee, a puzzle designer from Issaquah, Wash., posed this puzzle during his talk this ...

The original version of this story appeared in Quanta Magazine. David Bessis was drawn to mathematics for the same reason that many people are driven away: He didn’t understand how it worked. Unlike ...

There’s a line from the original Star Trek where Khan says, “Improve a mechanical device and you may double productivity, but improve man and you gain a thousandfold.” Joan Horvath and Rich Cameron ...