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 ...

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 ...

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 ...

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 ...

Follow Dr. Judah Folkman's quest to fight cancer by cutting off blood flow to tumors.

(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 ...

"Making Stuff" is produced in cooperation with the Materials Research Society (MRS), an international organization of nearly 16,000 materials researchers from academia, industry, and government, and a ...

"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 ...

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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 ...

This one-hour program is divided into six 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 ...