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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

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.

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