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Prehistoric ghost shark Helicoprion's spiral-toothed jaw explained

After a century of colourful guesses, CT scans have revealed what's really going on inside the nightmarish jaw of Helicoprion, a large, 270 million-year-old cartilaginous fish with an elaborate whorl of teeth set in the middle of its mouth.In 1899, Russian geologist, Alexander Petrovich Karpinsky, gave this six-metre-long fish the name Helicoprion, meaning "spiral saw", based on a fragmentary fossil found in Kazakhstan.

February 27, 2013 — Becky Crew

20 Questions with the Space Station

Video of the Week #81, February 27th, 2013: From: 20 Questions with the Space Station by Brian Malow at But Seriously... . Source: North Carolina Museum of Natural Sciences In his role at the North Carolina Museum of Natural Sciences, new SciAm blogger Brian Malow hosts a live linkup with the International Space Station, in which 20 students get to speak to an astronaut while he orbits the Earth.

February 27, 2013 — Bora Zivkovic

Young Scientists Encourage the Public to Demand Peer Review

It seems that more and more policy makers, advocacy groups, advertisers and media pundits are making claims based on science: this kind of potion is good for your health, that chemical is bad for the environment, this new technology can reduce crime.

February 27, 2013 — Mark Fischetti

Can Children Teach Themselves?

Sugata Mitra gave street kids in a slum in New Delhi access to a computer connected to the Internet, and found that they quickly taught themselves how to use it.

February 27, 2013 — Fred Guterl

A Visit to an India Full of Science and Engineering

I am writing this to you from New Delhi, India as I am here with the International Reporting Project as a New Media Specialist! We have been in the crowded, bustling, port city of Mumbai, the central city of Nagpur (home of several tiger refuges), the rural village area of Gadchiroli, and finally to the modern city of New Delhi in order to examine issues of child survival.

February 26, 2013 — Joanne Manaster

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Introducing Scientific American Health & Medicine

Introducing Scientific American Health & Medicine