Archive for March, 2007

New Security Scanner Sees Through Clothes, But With Modesty

Publication: National Geographic News   Date: March 27, 2007   View Article

A new sensor technology under development promises to give security screeners a peek through clothing without revealing the naked details, a scientist says.

Dolphin Numbers Still Low Despite “Safe” Tuna Fishing, Experts Say

Publication: National Geographic News   Date: March 26, 2007   View Article

Spotted and spinner dolphin populations in the eastern tropical Pacific Ocean have yet to recover, despite nearly 20 years of friendlier tuna fishing practices, researchers say.

But no one is quite sure why the dolphins are having a hard time bouncing back.

Pig DNA Study Suggests New Path of Pacific Human Migration

Publication: National Geographic News   Date: March 20, 2007   View Article

Like following a trail of genetic breadcrumbs, researchers have used pig DNA to reconstruct the migration route of humans out of Asia and into the Pacific.

Virgin Galactic, NASA Team Up to Develop Space-Plane Travel

Publication: National Geographic News   Date: March 20, 2007   View Article

Virgin Galactic, the space tourism venture of billionaire entrepreneur Sir Richard Branson, is the first step toward hypersonic travel between Earth-based cities, according to a company executive.

Bright, White Future for “Green” LEDs, Scientist Says

Publication: National Geographic News   Date: March 15, 2007   View Article

Rapid improvements to the efficiency and power of light-emitting diodes (LEDs) will soon allow the decades-old technology to revolutionize how we illuminate our world, according to an industry expert.

U.S. Developing Jets That Fly Five Times the Speed of Sound

Publication: National Geographic News   Date: March 14, 2007   View Article

The U.S. Air Force is preparing to test a new vehicle that could make missiles—and someday, jets—travel ten times faster than those flown today, military officials say.

The research vehicle, known as the X-51A, will be able reach hypersonic speeds when it is tested in 2009.

Forests Have Replaced Tundra Due to Warming, Study Finds

Publication: National Geographic News   Date: March 9, 2007   View Article

High in the Canadian Arctic, large tracts of tundra have given way to forests of spruce trees and bushes in response to a spike of warming temperatures nearly a century ago, according to a new study.

The transition took place more quickly than scientists thought, suggesting that tundra could keep shrinking as temperatures continue to warm.

© 2008-2010 Collected Writings By John Roach