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  • From Wordsworth's "The Prelude" ----------
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    This week's featured blog is "Bag of Worms Yet Words". Bag of Worms is not an easy read. The proprietor is not chatty, witty, or cynical; he does not seek to ridicule his ideological opponents. Instead he treats them and the argument seriously and respectfully, which is not to say that he worries a whit about hurting somebody's feelings. Instead, he bravely goes where the argument points him, which is often into territory others have ignored or are too timid to enter. The left's intelleltual elites, "the professoriat," the pundits, and the liberal judiciary are frequent subjects of his musings. Broad, deep, and ambibitious is the range of the topics he addresses: language theory, law, academia, politics, social theory, religion. The effort he puts into his thinking and writing pays off.

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« 113. Did Market and Religious Norms of Fairness Evolve with Large-Scale Human Society to Provide Social Cohesion? | Main | 115. Did Linguistic Recursion Originate By Acting Out In the Landscape? »

April 20, 2010

114. Was Mt. Toba Eruption a Genetic Bottleneck?

The eruption 74,000 years ago, it was hypothesized by Ambrose, devastated pre-modern human populations, destroying most of them and, with them, their genetic lines.  Present-day humans descended from a tiny number of modern humans, perhaps as few as several thousand mating pairs. Archaeological evidence in India appears to contradict the theory, showing human tool making activity immediately on top of the layer of the Toba ash. Toba made environments difficult, not impossible, weaking some populations and thereby, indirectly perhaps,  making it easier for another migration of modern humans out of Africa after Toba to replace them.

(H/T Sense of Events)

Posted by on April 20, 2010 at 10:23 AM in Values Journal |

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