there was another math problem that purportedly stumped Einstein, one which was far less consequential for the modern world and more in line with something you might find in a riddle book.

Rumor has it that Albert Einstein made up an impossibly difficult riddle when he was just a kid. There's no evidence to back up that apocryphal claim, but the rumor earned the popular logic ...

The story of quantum entanglement, perhaps the strangest concept in science. Mind-bending concepts and brilliant experiments lead us to a profound new understanding of reality.