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“Once that fluid had been a mortal danger; now it was a valuable commodity.” Erika Check Hayden writes about the biological secrets hidden in the blood of Ebola survivors, and a literal race to get their samples on a plane. Thrillingly structured, keenly reported, beautifully written—this is an A+ journalist operating at the top of her game.

In 1950, the US military laced Karl the Fog with opportunistic bacteria to simulate a bioterror attack on San Francisco. By Rebecca Kreston.

Sometimes chimps dance and then get very peaceful at waterfalls. What are they feeling? Brandon Keim discusses.

Rewrite the textbooks!