Research with living systems is never simple, scientists say, so there are many possible sources of variation in any experiment, ranging from the animals and cells to the details of lab technique. Geoff Tompkinson/Science Photo Library/Getty Images hide caption

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Geoff Tompkinson/Science Photo Library/Getty Images

Shark That Reproduced Sexually Switches To Asexually, Report Says

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Kim Kardashian and Donald Trump exemplify our contradictory feelings about the rich and famous. As Hidden Brain explores this week, we idolize the powerful, but also relish their downfall. D Dipasupil/WireImage hide caption

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D Dipasupil/WireImage

Don't Take A Selfie With An Orangutan, Or You Might Get Slapped

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Li Chunke, a carver at the state-owned Beijing Ivory Carving factory, at work in his Beijing workshop. Anthony Kuhn/NPR hide caption

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Anthony Kuhn/NPR

In China, A Shift Away From Trade In Ivory and Shark Fins

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New Gene-Editing Techniques Hold the Promise Of Altering The Fundamentals Of Life

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The killer whale J2, better known as "Granny," pokes her head out of the water in the Salish Sea near the San Juan Islands of Washington in July 2016. Granny, who was thought to be about 105 years old at the time, was presumed to have died later that year. Mark Malleson/Center for Whale Research/AP hide caption

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Mark Malleson/Center for Whale Research/AP

Menopause Mystery: Why Do Female Killer Whales Experience The Change Of Life?

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Want To Try Goat Yoga? There's A Waiting List

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The hyolith Haplophrentis extends the tentacles of its feeding organ (lophophore) from between its shells. The paired spines, or "helens," are propping the animal up off the ocean floor. Danielle Dufault/(C) Royal Ontario Museum hide caption

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Danielle Dufault/(C) Royal Ontario Museum

Musi, an African elephant, is one of Fresno Chaffee Zoo's five elephants enrolled in the Elephant Welfare Initiative. Courtesy of the Fresno Chaffee Zoo hide caption

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Courtesy of the Fresno Chaffee Zoo

Fitness Trackers Aim To Improve The Health And Happiness Of Zoo Elephants

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A deer was stuck to ice for over three hours in Simsbury, Conn., on Monday. It was rescued by wildlife officials and the event was streamed via Facebook Live. NBC4 Columbus/Screenshot by NPR hide caption

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NBC4 Columbus/Screenshot by NPR