In a thought experiment first proposed in the 1920s, the Hilbert’s Hotel has an infinite number of rooms and helps demonstrate some of the strange properties of infinity.

One of the oldest calculus problems, finding the area of a circle, can be visualized using a pizza. By dividing it up into ever smaller slices and laying them out next to one another, eventually you get something close a rectangle.

Zero and infinity. These seemingly opposite, obvious, and indispensable concepts are relatively recent human inventions. Discover the surprising story of how these key concepts that revolutionized mathematics came to be – not just once, but over and over again as different cultures invented and re-invented them across thousands of years.

The invention of cryptocurrency revolutionized much of tech, from surveillance to e-commerce.

From Bitcoin to NFTs, crypto is making headlines. But what exactly is it, and how does it work? Experts go beyond the hype and skepticism to unravel the social and technological underpinnings of crypto – exploring how it came to be and why this new technology may change more than just money.

The misalignment of our internal clocks and the sun could result in a handful of heath concerns, experts say.

Archaeologists are working to unveil Nazca geoglyphs stone by stone, but can AI help scientists identify and recover even more of these hillside geoglyphs?

The Nazca were an ancient group of farmers and fishermen that used desert plateaus as a canvas for giant geoglyphs. But some of these drawings pre-date the Nazca. Who created them and why?

One of the world’s greatest ancient enigmas, the Nazca lines are a dense network of criss-crossing lines, geometric shapes, and animal figures etched across 200 square miles of Peruvian desert. Who created them and why? Ever since they were rediscovered in the 1920s, scholars and enthusiasts have raised countless theories about their purpose.

Non-native species, like cats and honeybees, can either become naturalized, as a part of the ecosystem, or invasive and disrupt the ecosystem.

Without any natural predators, invasive lionfish populations grow unchecked and wreak havoc on marine ecosystems. Watch free divers hunt these poisonous fish.

Lionfish–long prized in home aquariums–have invaded the Atlantic, and are now one of the ocean’s most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to find out how they took over, why they’re doing so much damage, and what can be done about it.

The upcoming launch of NASA’s Artemis I is a big step toward sending humans back to the moon for the first time in 50 years. Discover what scientists hope this launch could mean for the future of space travel.

Psychedelics might interact with the brain by turning off the brain’s default mode network and affecting a thin sheet of gray matter called the claustrum. This could shake up communication between different regions of the brain.

Peyote is an important medicinal plant that is used in rites of passage and in religious and healing ceremonies in Indigenous communities.

Hallucinogenic drugs—popularly called psychedelics—have been used by human societies for thousands of years. Today, scientists are taking a second look at many of these mind-altering substances – both natural and synthetic – and discovering that they can have profoundly positive clinical impacts, helping patients struggling with a range of afflictions from addiction to depression and PTSD.

A machine learns from what’s programmed into it—and sometimes, that reinforces historical, discriminatory practices.

Here's how scientists developed a once-a-day pill that reduced the risk of sexually transmitted HIV transmission by 99%, a breakthrough that transformed the course of the HIV/AIDS epidemic.

Could we deflect an asteroid barreling toward Earth? NASA’s DART mission--the first test of its kind--showed that we may be able to knock an asteroid off its path, if we ever need to.

The deadliest part of a hurricane isn’t the wind–it’s water. Here’s what causes a storm surge, and which regions are most at risk.