Deep in the Navel

There are parts of the body that people tend to scrub well and others that may only get a passing wash. The belly button, Rob Dunn from North Carolina State University tells NPR's Talk of the Nation, might not be the cleanest spot, but it is home to tens of bacterial species in the average person, though across the population the navel is home to thousands of species.

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The London School of Economics' Daniele Fanelli argues at the Proceedings of the National Academy of Sciences that the reproducibility crisis in science isn't as dire as some say.

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In Science this week: analysis of DNA from ancient North Africans, and more.