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Science News for July 30, 2002


Scientists determine age of New World map

Researchers used carbon-dating technology to confirm the authenticity of the Vinland Map, dating it to approximately 1434 A.D. The map, if authentic, is believed to be the first known cartographic representation of North America. Its date would establish the history of European knowledge of the lands bordering the western Atlantic Ocean.

SourceDOE/Brookhaven National Laboratory·JournalRadiocarbon·DateJul 30, 2002

Some sports linked to unhealthy eating behaviors in girls

Research reveals that participation in weight-dependent sports increases the risk of disordered eating behaviors in girls. Risk factors include depression, history of sexual abuse, or substance abuse, but low body weight is not a reliable indicator.

SourceCenter for Advancing Health·JournalAmerican Journal of Health Promotion·DateJul 30, 2002

Cosmic rays linked to global warming

A new study suggests that cosmic rays could be the cause of global warming, proposing a height-dependent effect on cloudiness. The research proposes that increased cosmic ray intensity during periods of decreased solar wind may contribute to global cooling by stimulating the formation of dense clouds.

SourceAmerican Geophysical Union·DateJul 30, 2002
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Scientists find cause of dead crabs, fish off coast

Researchers at Oregon State University found extremely low oxygen levels in the lower water column, leading to mass die-offs of rockfish, Dungeness crabs, sculpins, and other marine life. The unusual event is attributed to coastal upwelling and wind patterns, not human activities.

SourceOregon State University·DateJul 30, 2002

Wild plant or food plant?

Researchers have identified a single genetic locus in the squash genus Cucurbita that controls phytolith production and plant defense. This discovery will help archaeologists determine whether ancient plants were domesticated or wild varieties by analyzing their phytolith content and cell configurations.

SourceSmithsonian Tropical Research Institute·JournalProceedings of the National Academy of Sciences·DateJul 30, 2002

Physicians' sun protection lapses match those of patients

Researchers found physicians and patients were equally likely to use sun protection when going outside for an hour or more. However, the specific forms of sun protection used differed, with physicians using sunscreen more frequently but less often staying in the shade or wearing protective clothing.

SourceCenter for Advancing Health·JournalAmerican Journal of Health Promotion·DateJul 30, 2002