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 ...

Ever since 1722, when Captain Jacob Roggeveen, a Dutchman and the first European known to have reached Easter Island arrived, scholars have debated the origins of the isolated population he found ...

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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 ...

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 ...

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 ...

When I was born, the doctors couldn't tell my parents what I was: They couldn't tell if I was a boy or a girl. Between my legs they found "a rudimentary phallus" and "fused labio-scrotal folds." They ...

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 ...

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 ...

In this four-part special, technology columnist and best-selling author David Pogue takes a wild ride through the cutting-edge science that is powering a next wave of technological innovation. Pogue ...

This hour-long program is divided into five chapters. Choose any chapter below and select QuickTime or Windows Media Player to begin viewing the video. If you experience difficulty viewing, it may be ...