Parasites play crucial roles in keeping ecosystems healthy, as does this larval trypanorhynch tapeworm, which infects fish. Chelsea Wood hide caption
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Gray reef sharks hang out together in French Polynesia. Bernard Radvaner/Corbis/Getty Images hide caption
In this NOAA satellite image, Hurricane Dorian is a Category 2 storm. It moved slowly past the Bahamas as it unleashed massive flooding. Getty Images hide caption
The Arecibo Observatory in Puerto Rico is seen after Hurricane Maria hit it in September 2017. Joe Raedle/Getty Images hide caption
A new study of Deinosuchus or "terror crocodiles," led by Adam Cosette, offers a fuller picture of the ancient creature from head to tail. Cossette said Deinosuchus had large, robust teeth, ranging from six to eight inches long, as shown in the photo. Adam Cossette hide caption
President Trump announces on July 28 that Eastman Kodak will receive a loan to manufacture ingredients used in pharmaceuticals. Alex Wong/Getty Images hide caption
A family photo shows Buddy and 10-month-old Duke this past winter. The puppy, who tested positive for antibodies but never got sick, has been sleeping in all of Buddy's old spots, his owners say. Kholood Eid/National Geographic hide caption
1st U.S. Dog With COVID-19 Has Died, And There's A Lot We Still Don't Know
Russian President Vladimir Putin announced the approval of Russia's coronavirus vaccine during a government meeting on Tuesday. Alexey Nikolsky/Sputnik/AFP via Getty Images hide caption
At Least 97,000 Children Tested Positive For Coronavirus In Last 2 Weeks Of July
On the left is an unmodified hatchling of a longfin inshore squid (Doryteuthis pealeii). The one on the right was injected with CRISPR-Cas9 targeting a pigmentation gene before the first cell division. It has very few pigmented cells and lighter eyes. Karen Crawford hide caption
Parasites play crucial roles in keeping ecosystems healthy, as does this larval trypanorhynch tapeworm, which infects fish. Chelsea Wood hide caption
A man wearing a protective mask walks next to travelers as they line up to board a boat in Stockholm, Sweden. Jonathan Nackstrand/AFP via Getty Images hide caption
A nurse holds a COVID-19 vaccine candidate produced by Chinese company Sinovac Biotech at the São Lucas Hospital in Porto Alegre, Brazil, on Aug. 8. Silvio Avila/AFP via Getty Images hide caption
An installation of children's art is set up outside the Capitol on Wednesday. Kids can develop "severe" symptoms from the coronavirus, the Centers for Disease Control and Prevention said in a report released Friday. Jemal Countess/Getty Images for ParentsTogether hide caption
For a scientific experiment, a man sits in front of a computer, and an EEG measures the electrical signals released by neurons in his brain. Getty Images hide caption
Potential COVID-19 vaccines are kept in a tray at Novavax labs in Maryland on March 20. The Novavax vaccine requires an immune-boosting ingredient called an adjuvant to be effective. Andrew Caballero-Reynolds/AFP via Getty Images hide caption
Researchers uncover why shaving can cause sharp blades to dull quickly. Gustavo Rezende Dos Santos/EyeEm/Getty Images hide caption
Lawmakers in California say the state's pattern of single-family zoning is boosting carbon emissions. ullstein bild/via Getty Images hide caption
A woman carrying her mask walks past a sign mandating the wearing of face coverings in Palisades Park in Santa Monica on July 25. Robyn Beck/AFP via Getty Images hide caption
Virginia Gov. Ralph Northam speaks during a news conference in Richmond, Va. on June 4. Virginia has rolled out a smartphone app to automatically notify people if they might have been exposed to the coronavirus. Steve Helber/AP hide caption
Conner Curran, 9, (right) and his brother Will, 7, at their home in Ridgefield, Conn. The gene therapy treatment that stopped the muscle wasting of Conner's muscular dystrophy two years ago took more than 30 years of research to develop. Kholood Eid for NPR hide caption
Scientists in Canada have diagnosed malignant cancer for the first time in a dinosaur, a Centrosaurus apertus from 76 to 77 million years ago. Sergey Krasovskiy/Stocktrek Images/Getty Images hide caption
Farmers work during a harvest in Jutland, Denmark. People keep worrying about food shortages. Some economists say the fears actually create their own problems. Nick Brundle Photography/Getty Images hide caption