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"There's a sense we as humans have kind of peaked," agreed Greg Wray, director of Duke University's Center for Evolutionary Genomics.

"A different way to look at is it's almost impossible for evolution not to happen." Still, the findings also are controversial, because it's far from clear what effect the genetic changes had or if they arose when Lahn's "molecular clock" suggests — at roughly the same time period as some cultural achievements, including written language and the development of cities.

Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.

In fact, the variations were so common they couldn't be accidental mutations but instead were probably due to natural selection, where genetic changes that are favorable to a species quickly gain a foothold and begin to spread, the researchers report.

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Words are better understood than grammar as a guide to language history; the same sentence structure can arise independently in different tongues.

Nineteenth Century, The [UK][USA] - a catalougue of over 20,000 books published in the nineteenth century and microfilmed as part of Chadwyck Healey Ltd and The British Library's The Nineteenth Century project onto the internet.

=Nineteenth Century Contexts - An Interdisciplinary Journal - affiliated with the international scholarly society Interdisciplinary Nineteenth-Century Studies (INCS). to be published twice yearly, beginning in the Fall of 1999?

The finding hints that farmers in what is now Turkey drove the language boom - and not later Siberian horsemen, as some linguists reckon.

Russell Gray and Quentin Atkinson, of the University of Auckland in New Zealand use the rate at which words change to gauge the age of the tree's roots - just as biologists estimate a species' age from the rate of gene mutations.

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