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Social change may explain decline in genetic diversity of the Y chromosome at the end of the Neolithic period ( phys.org )

The emergence in the Neolithic of patrilineal social systems, in which children are affiliated with their father's lineage, may explain a spectacular decline in the genetic diversity of the Y chromosome observed worldwide between 3,000 and 5,000 years ago....

US orders testing for certain dairy cows after H5N1 avian flu remnants found in retail milk ( www.cidrap.umn.edu )

A day after the Food and Drug Administration (FDA) announced that H5N1 avian flu fragments have been found in retail milk samples, the US Department of Agriculture (USDA) today announced that lactating dairy cows must be tested before interstate transport....

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