Seismic sentries: Why underground nuclear tests are so hard to hide

Article Abstract:

Seismometers around the world picked up a magnitude 4.2 event in North Korea on October 9, 2006, later confirmed to be an underground nuclear test. Although the procedure to differentiate seismic waves generated from earthquakes and nuclear tests is complicated, it is impossible to perform an undetected underground nuclear test due to the network of seismometers recording all seismic disturbances anywhere in the world.

Product information, Measuring & controlling devices, not elsewhere classified, Other Measuring and Controlling Device Manufacturing, North Korea, Seismographs, Usage, Testing, Underground nuclear explosions, Seismic waves, Seismometers

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Deeper impact: was yet another mass extinction the work of an asteroid?

Article Abstract:

Researchers believe that an asteroid struck the earth 185 million years ago, between the Permian and Triassic periods, killing 95% of the ocean life and 70% of land life that was present at that time. Researchers found evidence of helium and argon gases with isotopic signatures that could only have originated from the cosmos, as they are not found on earth.

Research, Asteroids, Mass extinction, Climatic changes, Climate change, Mass extinction theory

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Bidding on bones

Article Abstract:

Paleontologists fear research could be slowed as public online auctions of fossils push prices for artifacts out of their budgets. They are particularly upset with the Discovery Channel's promotion of such auctions.

Marketing, Political activity, Public opinion, Fossils, Discovery Communications Inc., Paleontologists

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