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For years, the satellites that make up America's Global Position System have been carrying sensors that measure the weather in space. This image illustrates the orbital planes in which GPS satellites travel around Earth. Courtesy of Los Alamos National Laboratory hide caption

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Courtesy of Los Alamos National Laboratory

An artist's impression of Saccorhytus coronarius, a sea creature that lived 540 million years ago. Jian Han, Northwest University, China hide caption

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Jian Han, Northwest University, China

Scientists Describe Ancient Bag-Like Sea Creatures From China

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Biologist Shaun Clements counts down the seconds before emptying a vial of synthetic DNA into a stream near Alsea, Oregon. Jes Burns/Oregon Public Broadcasting/EarthFix hide caption

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Jes Burns/Oregon Public Broadcasting/EarthFix

The micromotor device may someday be used to deliver antibiotics to the stomach. Angewandte Chemie International Edition hide caption

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Angewandte Chemie International Edition

This Tiny Submarine Cruises Inside A Stomach To Deliver Drugs

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Doomsday Clock Closest To Midnight Since 1954

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Medicaid doesn't just provide health care for the poor; it also pays for long-term care for a lot of older people, including the majority of nursing home residents. Repealing the ACA could change the way Medicaid programs are funded. Bill Gallery/Doctor Stock/Science Faction/Getty Images hide caption

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Bill Gallery/Doctor Stock/Science Faction/Getty Images

Obamacare Repeal Could Threaten Provisions That Help Older Adults

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Multiple Twitter accounts claiming to be run by members of the National Park Service and other U.S. agencies have appeared since the Trump administration's apparent gag order. The account owners are choosing to remain anonymous. David Calvert/Getty Images hide caption

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David Calvert/Getty Images

Apollo 1 astronauts Ed White (from left), Gus Grissom and Roger Chaffee, 1967. The astronauts died as a result of a fire in the cockpit during a training session on Jan. 27, 1967. Keystone/Hulton Archive/Getty Images hide caption

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Keystone/Hulton Archive/Getty Images

50 Years Later, NASA Creates Tribute To 3 Astronauts Who Died In Space Race

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Former EPA Scientist Weighs In On Fate Of Climate Science Under Trump

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A self-portrait taken by Cajal in his library when he was in his 30s. Courtesy Instituto Cajal del Consjo Superior de Investigaciones Científicas, Madrid hide caption

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Courtesy Instituto Cajal del Consjo Superior de Investigaciones Científicas, Madrid

Art Exhibition Celebrates Drawings By The Founder Of Modern Neuroscience

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