Moon formed from collision with Mars-mass asteroid
The Moon likely formed from debris after a Mars-mass asteroid struck Earth off-center, researchers say. Robin Canup of the Southwest Research Institute and Erik Asphaug of UC Santa Cruz argue this smaller-impact scenario, once proposed in the 1970s, fits current simulations and removes the need for a second large impact.
MENTIONED IN THIS ARTICLE
Moon
Earth
Mars
Robin Canup
Canp
Southwest Research Institute
Boulder
Colo
Camp
Erik Asphaug
University of California, Santa Cruz
Mars sized asteroid theory returns to favor for moon origin
The 1970s hypothesis that a Mars sized asteroid struck Earth to form the moon gains renewed support in Nature. Scientists cite iron lack in the moon and dynamics that explain material ejection, while critics note simulations focus on initial impact and assume rocky ejecta rather than rubble.
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Earth
Nature
Moon
Cameron
Harvard
Camp
Rural roads deadly despite lighter traffic and funding gaps
A GAO study shows rural local roads kill more per mile than urban freeways. In 1999 rural roads carried vast traffic but received far less federal money, prompting officials including Bob Fogel and John Horsley to push for safety funding and widening two lane routes.
MENTIONED IN THIS ARTICLE
Washington
Bob Fogel
National Association of Counties
General Accounting Office
GAO
Lindsay Griffin
Transportation Safety Center
Texas A&m Transportation Institute
John Horsley
American Association of State Highway and Transportation Officials
Court stays Texas execution in Beazley case
Napoleon Beazley, 25, won a stay of execution less than four hours before he was set to die. The Texas Court of Criminal Appeals granted the delay as his case continues to divide the U.S. Supreme Court and renew debate over applying the death penalty to juveniles.
MENTIONED IN THIS ARTICLE
Napoleon Beazley
Beazley
U.S. Supreme Court
Texas Court of Criminal Appeals
Study finds rising recalls of heart rhythm devices
Chicago AP reports that safety alerts and recalls for pacemakers and implantable defibrillators are frequent and growing. Over the last decade more than half a million devices faced recalls or alerts with 16 percent of U S patients affected last year. Costs reached about 870 million dollars from 1990 to 2000 amid Malfunctions and computer errors.
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Chicago
Journal of the
American Medical Association
U.S
William H. Maisel
Boston
Brigham and Women’s Hospital
Food and Drug Administration
Dick Cheney
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