Discover the 25 unsolved mysteries that still haunt scientists. From dark matter to the arrow of time, explore the universe's ...

One question in computer science has stood above the rest for decades, resisting every attempt to settle it despite its enormous implications. At the center of the mystery is a deceptively simple idea ...

(PhysOrg.com) -- Just over a century ago, one of the world’s leading mathematicians posed this question to a number of his colleagues: What are the most important unsolved questions in mathematics?

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...