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 ...

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 ...

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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 ...

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 ...

Around 250 B.C., the Greek mathematician Archimedes calculated the ratio of a circle's circumference to its diameter. A precise determination of pi, as we know this ratio today, had long been of ...

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 ...

(This program is no longer available for online streaming.) Almost a century ago, paleontologists found the first tantalizing hints of a monster even bigger than Tyrannosaurusrex, perhaps the largest ...

"Beautiful beyond exaggeration," is how one Spanish chronicler described Tanta Carhua. Carhua was a ten-year old Inca child whose father offered her to the Inca Emperor as a Capacocha sacrifice. She ...

The question of who built the pyramids, and how, has long been debated by Egyptologists and historians. Standing at the base of the pyramids at Giza it is hard to believe that any of these enormous ...