Sexuality and gender play a profound role in shaping identity, but for much of human history how they are determined has remained obscure. How does sexual orientation develop? What is it? Can it be changed?

Not long ago, the idea of a computer beating a human at chess was the stuff of science fiction. But some of the most creative programmers of the 1980s and 90s were determined to make it a reality. And they did.

Einstein dreamed of a unified theory of nature’s laws. String theory has long promised to deliver it: a mathematically elegant description that some have called a “theory of everything.” Join …

We’ve discovered thousands of exoplanets, but what about exomoons? Astronomer David Kipping joins Brian Greene to explore the ongoing search for exomoons—lesser-known, but intriguing potential habitats for life beyond Earth. …

Why is there something rather than nothing? And what does ‘nothing’ really mean? More than a philosophical musing, understanding nothing may be the key to unlocking deep mysteries of the universe, from dark energy to why particles have mass.

The mysteries of dark matter and dark energy may be evidence that we don’t fully understand the force of gravity. But when it comes to a force that has been studied mathematically and probed observationally for hundreds of years, what do we still need to learn?