Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. Two puzzles are presented each week: the Riddler Express for those ...

You and your team of cyclists are climbing a mountain with a constant gradient in the Tour de FiveThirtyEight. You make the climb single file, with one rider in front of the other. The first rider ...

Add Yahoo as a preferred source to see more of our stories on Google. In this riddle, figure out how many slices of pizza you’ll get at the robot pizza shop. Calls to invoke the 25th Amendment grow ...