Hannah Cairo found herself stuck on a problem that wouldn’t leave her mind. It wasn’t a regular homework assignment—it was a decades-old mathematical puzzle believed to be true by leading experts in ...

Humans can remember various types of information, including facts, dates, events and even intricate narratives. Understanding ...

It was the Greek philosopher Heraclitus who wrote, “The only constant in life is change.” People weren’t comfortable with change when he wrote that, some 2,600 years ago, and we’re still not.