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A rooftop is covered with solar panels at the Brooklyn Navy Yard in New York last February. The Trump administration is considering whether to impose tariffs on imports of solar materials. Mark Lennihan/AP hide caption

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Mark Lennihan/AP

Microorganisms play a vital role in growing food and sustaining the planet, but they do it anonymously. Scientists haven't identified most soil microbes, but they are learning which are most common. PeopleImages/Getty Images hide caption

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PeopleImages/Getty Images

Scientists Peek Inside The 'Black Box' Of Soil Microbes To Learn Their Secrets

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Moscow Sees Only 6 Minutes Of Sunlight During All Of December

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Scientists Edge Closer To A Blood Test To Detect Cancers

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When you smell ginger root or petrol, do you have a specific word to describe the odor? From left Jay Reed/NPR, Dorling Kindersley/Getty Images, TS Photography/Getty Images hide caption

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From left Jay Reed/NPR, Dorling Kindersley/Getty Images, TS Photography/Getty Images

In one study, participants who routinely got less than seven hours of sleep were coached to extend their sleep time. They also changed their diets, without being asked — taking in less sugar each day. Jenny Dettrick/Getty Images hide caption

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Jenny Dettrick/Getty Images

Yellows, oranges and reds show regions where the average temperature from 2013 to 2017 was higher than a baseline average from 1951 to 1980, according to an analysis by NASA's Goddard Institute for Space Studies. NASA's Scientific Visualization Studio hide caption

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NASA's Scientific Visualization Studio

Aaron Hernandez (81), of the New England Patriots, lost his helmet during this play against the New York Jets in 2011. Hernandez killed himself in 2017, and researchers found that he had had one of the most severe cases of CTE ever seen in someone his age. Elsa/Getty Images hide caption

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Repeated Head Hits, Not Just Concussions, May Lead To A Type Of Chronic Brain Damage

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Robert Murray of Murray Energy (right) meets with Energy Secretary Rick Perry at the Department of Energy headquarters in Washington in a March 29, 2017, photo obtained by The Associated Press. Simon Edelman/AP hide caption

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Simon Edelman/AP

Dr. Mathilde Krim at the World AIDS Day Symposium presented by the Foundation For AIDS Research and the Columbia University Mailman School of Public Health in 2002. Krim had a knack for helping people talk about HIV/AIDS rationally, colleagues say. Theo Wargo/WireImage hide caption

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Theo Wargo/WireImage

Pioneering HIV Researcher Mathilde Krim Remembered For Her Activism

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A grande Cafe Nero, large Costa Coffee and venti-sized Starbucks to-go cups sold in London. The U.K. Parliament is considering a tax on disposable cups in an effort to cut down on waste. Ben Pruchnie/Getty Images hide caption

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Ben Pruchnie/Getty Images

Ronda Goldfein, attorney and executive director of the AIDS Law Project of Pennsylvania, holds an envelope that revealed a person's HIV status through the clear window. Elana Gordon/WHYY hide caption

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Elana Gordon/WHYY

Aetna Agrees To Pay $17 Million In HIV Privacy Breach

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