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Hey, We're Not Done Yet

University College London's Steve Jones says that human evolution is slowing down due to a number of factors, including life expectancy, different timing of reproduction (particularly for men), and intermarriage. Both Gene Expression's Razib and Evolving Thought's John Wilkins say this isn't so. Razib unpacks Jones's arguments to walk through how population genetics really works. Wilkins writes, "Actual studies on wild populations show that evolution is not a monotonous gradual process always and everywhere the same, but a process of fits and starts, diffusion and collection, and where one pressure is removed, others take its place immediately."

Or are we accelerating?

The Scan

Pig Organ Transplants Considered

The Wall Street Journal reports that the US Food and Drug Administration may soon allow clinical trials that involve transplanting pig organs into humans.

'Poo-Bank' Proposal

Harvard Medical School researchers suggest people should bank stool samples when they are young to transplant when they later develop age-related diseases.

Spurred to Develop Again

New Scientist reports that researchers may have uncovered why about 60 percent of in vitro fertilization embryos stop developing.

Science Papers Examine Breast Milk Cell Populations, Cerebral Cortex Cellular Diversity, Micronesia Population History

In Science this week: unique cell populations found within breast milk, 100 transcriptionally distinct cell populations uncovered in the cerebral cortex, and more.