Editor’s Note: Published in 1957, this article comes from Martin Gardner’s legendary Scientific American column Mathematical Games. Read more in our special digital issue, Fun and Games. A paradox is ...

Historical Context: The paradox gained prominence during the Space Age, as our understanding of the universe’s scale grew. With over 100 billion galaxies, each containing billions of stars, the ...

Mathematics often feels straightforward, yet some results challenge the way people instinctively think about numbers. Certain paradoxes and probability problems produce answers that seem impossible at ...

We play a game, where I am the host and you are the player. As the host, I have two cards, and I write down a number on each card. The numbers are unequal. You can't see the numbers, and the object of ...