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.

The February storm left dozens of Texans dead and millions without power—and exposed an aging energy grid unprepared for a changing climate. Can we build something better? Ice and snow cover plants in ...

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 ...

This is a modified/interactive version of one of the neuro-behavioral tests that the climbers will be taking en route to the summit to measure their mental abilities. To find out about this and other ...

When the subject of alien abductions was first suggested as a possible NOVA, I was intrigued. As a long-time sci-fi buff and one open-minded to the notion of extraterrestrial intelligence, I could not ...

About 40,000 years ago, near the dawn of the 30-millennia-long period known as the Upper Paleolithic, the first anatomically modern humans suddenly and mysteriously revolutionized their cultures with ...

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Few attributes of being human have attracted more intense thought than the simple fact that, unlike all other living mammals, we walk upright on two legs. Human bipedalism represents a major ...

Mighty, elemental forces molded North America—fiery eruptions, titanic floods, the grinding of great ice sheets, and massive impacts from space all shaped our homeland. The epic three-part series ...

Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. This astonishing fact comes by way of Christopher Landsea, a ...

Imagine a place where more than 280 people have defied Earth's gravity, risking their lives to do science 250 miles above us. Here, on the International Space Station, unexpected challenges are a ...

Your perception of time depends on how you are moving.