Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific ...

An airplane, traveling with a constant engine speed, makes a large and perfect circle parallel to the ground. There is no wind. Will it complete the same circle in greater, less or the same time if ...

Math Puzzle: Only intelligent minds can solve this math puzzle by finding the missing value in 17 seconds. Are you one of them? Try now! A math puzzle is a type of brain teaser that tests the reader's ...

Math Puzzle: In this math puzzle, the final number is missing. Do you have the most intelligent brain that can solve the math puzzle in 11 seconds? Test your math skills now! Math puzzles are a good ...

The following is adapted from the introduction to “The Riddler: Fantastic Puzzles from FiveThirtyEight,” published by W. W. Norton & Co. It is in stores today! The world’s oldest collection of math ...

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, ...