Earth’s Magnetic Field Was Not Always as Strong as Today

Scientists at the University of Rochester have discovered that the Earth’s magnetic field 3.5 billion years ago was only half as strong as it is today, and that this weakness, coupled with a strong wind of energetic particles from the young Sun, likely stripped water from the early Earth’s atmosphere.

The findings, presented in Science, suggest that the magnetopause — the boundary where the Earth’s magnetic field successfully deflects the Sun’s incoming solar wind — was only half the distance from Earth it is today.

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Nature Unleashed:Moderate 6.4 Quake Rattles Southern Taiwan

A moderate earthquake shook southern Taiwan on Thursday, knocking out electric service to more than half a million customers and causing a fire in a textile factory, although injuries appeared to be limited, government agencies said.

The quake, with a magnitude of 6.4, struck at 8:18 a.m. in a mountainous region near the southern city of Kaohsiung, the Central Weather Bureau reported on its Web site. More than 120 aftershocks have since been recorded, the bureau said.Buildings in the capital, Taipei, also swayed for several minutes.The quake forced six high-speed trains linking Taipei to southern Taiwan to suspend operations and caused five fires, the officer said.

One fire, in a textile plant in southern Tainan County, was estimated to have caused more than $3 million in damage, the state-run Central News Agency said.

Earthquakes occur frequently in Taiwan, located on a seismically active stretch of the Pacific basin. In September 1999, a quake measuring 7.6 killed more than 2,400 people and destroyed or damaged 50,000 buildings. That quake caused the temporary closure of a number of manufacturing plants where computer chips and circuit boards are made.

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Pictures of Quake

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‘Missing Link’ Fossil Was Not Human Ancestor as Claimed, Anthropologists Say

A fossil that was celebrated last year as a possible “missing link” between humans and early primates is actually a forebearer of modern-day lemurs and lorises, according to two papers by scientists at The University of Texas at Austin, Duke University and the University of Chicago.

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Number of GPS Satellites will Soon go up to 27

In Afghanistan, American combat forces have come to rely on satellites as well as their rifles and body armor to carry out missions effectively, and to stay alive.But they have found that satellite signals are weakened and even blocked outright by the breathtaking peaks and backbreaking valleys of Afghanistan making it hard to pinpoint the troops’ location, navigate on patrol, identify friend from foe in battle or call in bombs and artillery when under attack.

So the top officer of the military’s Strategic Command, which is better known for control of the nation’s nuclear arsenal, has ordered up what might be called a “satellite surge” to increase the coverage and accuracy for GPS devices in the war zone.

The constellation of operational satellites that allows GPS devices to work is being expanded over the next year or two to 27 from 24.The increase will benefit civilians as well as soldiers. Drivers, sailors, hikers and golfers around the globe will share in the improved performance of their GPS devices.

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