The mathematician, who liked to annoy friends with improvised brainteasers, thought for a moment or two, then raised a glass ...

Brain-training games are all the rage, but whether they prevent cognitive decline has been debatable. Studies in recent years have gone back and forth on the topic, with no definitive conclusion. Many ...

Some say the reason most manhole covers are round is that a circle cannot fall through a smaller circular hole. Which of these other two-dimensional shapes cannot fall through a hole that is the same ...

The puzzle game genre is unbelievably vast, including everything from cozy mobile titles and daily brain teasers to dark puzzle-platformers and detective games. As a result, trying to narrow down the ...