Christopher Joyce Christopher Joyce is a correspondent on the science desk at NPR. His stories can be heard on all of NPR's news programs, including NPR's Morning Edition, All Things Considered, and Weekend Edition.

Karin Bruwelheide handles an amputates limb that dates back to the Civil War. The bones were discovered by scientists at Manassas National Battlefield Park in Virginia. Scientists at the Smithsonian Institution's National Museum of Natural History have been analyzing the bones to learn more about them and who they may have belonged to. Meredith Rizzo/NPR hide caption

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Meredith Rizzo/NPR

Civil War Battlefield 'Limb Pit' Reveals Work Of Combat Surgeons

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Scientists have videotaped sharks traveling a 500-mile-long "shark highway" in the Pacific Ocean. Andy Mann/Waitt Foundation/Pacifico hide caption

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Andy Mann/Waitt Foundation/Pacifico

Scientists Take A Ride On The Pacific's 'Shark Highway'

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The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, shown in an artist's rendering, will measure tiny fluctuations in Earth's gravitational field to show how water moves around the planet. NASA/JPL hide caption

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NASA/JPL

NASA Launching New Satellites To Measure Earth's Lumpy Gravity

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Austin Steeves packages lobsters after hauling traps on his grandfather's boat in Casco Bay, Portland, Maine. Derek Davis/Portland Press Herald via Getty Images hide caption

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Derek Davis/Portland Press Herald via Getty Images

Warming Waters Push Fish To Cooler Climes, Out Of Some Fishermen's Reach

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An infrared satellite image shows Hurricane Harvey just prior to making landfall on Aug. 25, 2017. Warm water in the Gulf of Mexico fed heavy rains, according to new research. Getty Images hide caption

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Getty Images

The biggest fingerling salmon in this Alaskan fish hatchery are likely born to the biggest mothers. Education Images/UIG via Getty Images hide caption

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Education Images/UIG via Getty Images

The Bigger The Mother Fish, The More Babies She Has

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A dried-out reservoir in Thailand. Taylor Weidman/Bloomberg via Getty Images hide caption

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Taylor Weidman/Bloomberg via Getty Images

A Temperature Roller Coaster Could Be Coming

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An illustration from 1870 shows Prehistoric men using wooden clubs and stone axe to fend off an attacks by a large cave bear. The cave bear (Ursus spelaeus) was a species of bear that lived in Europe during the Pleistocene and became extinct at the beginning of the Last Glacial Maximum, about 27,500 years ago. Mammoths can be seen in the background. British Library/Science Source hide caption

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British Library/Science Source

New Study Says Ancient Humans Hunted Big Mammals To Extinction

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The Thomas Fire advanced toward Santa Barbara County on Dec. 10, 2017, in Carpinteria, Calif. David McNew/Getty Images hide caption

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David McNew/Getty Images

As Climate Costs Grow, Some See A Moneymaking Opportunity

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A new satellite, called MethaneSAT,will track methane emissions from oil and gas fields, as well as agriculture and natural sources. It's due for launch in three years. Environmental Defense Fund hide caption

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Environmental Defense Fund

A prep cook at a San Francisco restaurant drops fish skin into a food scrap recycling container. Turning food waste into fertilizer is popular in parts of Europe and is catching on in the U.S. But tiny plastics are also making their way into that fertilizer — and into the food chain. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

Another Place Plastics Are Turning Up: Organic Fertilizer From Food Waste

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The Great Pacific Garbage 'Patch' Much Bigger Than Previously Thought

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Flooding in Boston's North End during a nor'easter storm on Friday. A new government report suggests floods will become more common over the next century. David L. Ryan/Boston Globe via Getty Images hide caption

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David L. Ryan/Boston Globe via Getty Images

New Report Predicts Rising Tides, More Flooding

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