This Week in PNAS

Researchers led by Cornell University's Alon Keinan report in the Proceedings of the National Academy of Sciences that the human population has increased by about 100-fold during the past 3,000 years to 4,000 years. By focusing on regions of the human gene that are under neutral selective pressures and examining them in people with homogenous ancestry, they devised models showing that people have been experiencing a 3.4 percent population growth rate per generation for about the last 140 generations.

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Researchers describe a way to share data while keeping it secure, Agence France Presse reports.

In Science this week: genetic mutations typically associated with esophageal cancer are common in older, healthy individuals, and more.

India's Council of Scientific and Industrial Research has a new director-general, according to ScienceInsider.

A new study links more than a hundred genes to autism spectrum disorder, Discover's D-brief blog reports.