Elephants don't grow so large overnight. And a new study published in PNAS shows that it takes at least 24 million generations for a mammal the size of a mouse to evolve into something as big as an elephant, reports Veronique Greenwood at Discover magazine's 80beats blog.

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US News & World Report writes that genetic testing of lung tumors can help identify treatments for patients.

A team of researchers plans to sample Loch Ness for environmental DNA, according to Newsweek.

The New York Times writes about the appearance of mosaicism in healthy people.

In PNAS this week: insecticide resistance patterns Anopheles gambiae mosquito, transcriptome patterns in Pseudomonas aeruginosa during infection, and more.