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Left: Dirk Hoffmann and Alistair Pike sample calcite from a calcite crust on top of the red scalariform sign in La Pasiega.Right: Drawing of Panel 78 in La Pasiega by Breuil et al.(1913). The red scalariform (ladder) symbol has a minimum age of 64,000 years but it is unclear if the animals and other symbols were painted later. J. Zilhão (left) / Breuil et al. (1913)/Science Advances hide caption

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J. Zilhão (left) / Breuil et al. (1913)/Science Advances

Cave Art May Have Been Handiwork Of Neanderthals

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Rosemary Grant is a registered nurse and helps coordinate sepsis care at Harborview Medical Center in Seattle. The center's goal, she says, is to get a patient who might be developing sepsis antibiotics within three hours. Ian C. Bates for NPR hide caption

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Ian C. Bates for NPR

Synergy Between Nurses And Automation Could Be Key To Finding Sepsis Early

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Kristopher Kelly near his home in Concrete, Wash., in February. He broke his pelvis and all his ribs in a work accident last year. The resulting infection he developed in the hospital almost killed him. Ian C. Bates for NPR hide caption

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Ian C. Bates for NPR

Did An IV Cocktail Of Vitamins And Drugs Save This Lumberjack From Sepsis?

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Shaorong Deng gets an experimental treatment for cancer of the esophagus that uses his own immune system cells. They have been genetically modified with the gene-editing technique known as CRISPR. Yuhan Xu/NPR hide caption

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Yuhan Xu/NPR

Doctors In China Lead Race To Treat Cancer By Editing Genes

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Francisco Hidalgo prepares to receive a trigger point injection from Dr. Alexis LaPietra (right) at St. Joseph's University Medical Center in Paterson, N.J., while Dr. Tyler Manis observes. An alternative to opioids, the trigger point injection involves dry needling to stop pain from a muscle spasm and a shot of local anesthetic for the soreness from the needle. Hansi Lo Wang/NPR hide caption

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Hansi Lo Wang/NPR

ER Reduces Opioid Use By More Than Half With Dry Needles, Laughing Gas

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Royal Australian Navy Lt. Elizabeth Livingstone and Singapore Army Maj. Paul Zhao perform cataract surgery aboard the hospital ship USNS Mercy during a visit to Quy Nhon, Vietnam in 2010. Mass Communication Specialist 2nd Class Eddie Harrison/U.S. Navy hide caption

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Mass Communication Specialist 2nd Class Eddie Harrison/U.S. Navy

Health and Human Services Secretary Alex Azar speaks to the House Ways and Means Committee last week in Washington about the FY19 budget. Jacquelyn Martin/AP hide caption

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Jacquelyn Martin/AP

Virginia Harrod, an attorney and county prosecutor who lives in rural Kentucky, survived breast cancer, only to develop lymphedema, which sent her to the hospital three times with serious infections. A lymph node transplant helped restore her immune system. Luke Sharrett for NPR hide caption

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Luke Sharrett for NPR

She Survived Breast Cancer, But Says A Treatment Side Effect 'Almost Killed' Her

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Abraham Vidaurre, 12, checks his arm after receiving an HPV vaccination at Amistad Community Health Center in Corpus Christi, Texas, in 2016. Though gender differences in vaccine rates have narrowed, more girls than boys tend to get immunized against HPV. The Washington Post/The Washington Post/Getty Images hide caption

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The Washington Post/The Washington Post/Getty Images

This Vaccine Can Prevent Cancer, But Many Teenagers Still Don't Get It

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This light micrograph of a part of a brain affected by Alzheimer's disease shows an accumulation of darkened plaques, which have molecules called amyloid-beta at their core. Once dismissed as all bad, amyloid-beta might actually be a useful part of the immune system, some scientists now suspect — until the brain starts making too much. Martin M. Rotker/Science Source hide caption

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Martin M. Rotker/Science Source

Smallpox virus, colorized and magnified in this micrograph 42,000 times, is the real concern for biologists working on a cousin virus — horsepox. They're hoping to develop a better vaccine against smallpox, should that human scourge ever be used as a bioweapon. Chris Bjornberg/Science Source hide caption

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Chris Bjornberg/Science Source

Did Pox Virus Research Put Potential Profits Ahead of Public Safety?

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Urine testing to diagnose illness or to detect the presence of drugs is generally routine. But a woman who gave her doctor a urine sample months after back surgery got socked with a huge bill. SPL/Science Source hide caption

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SPL/Science Source

Liz Moreno thought she was done paying for her back surgery in 2015. But a $17,850 bill for a urine test showed up nine months later. Her father, Paul Davis, a retired doctor from Ohio, settled with the lab company for $5,000 in order to protect his daughter's credit history. Julia Robinson for KHN hide caption

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Julia Robinson for KHN

How A Urine Test After Back Surgery Triggered A $17,850 Bill

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Influenza covers its shell with two types of accessories: the H spike, blue, and the N spike, red. Here the flu particle is sliced open to show its genetic material. Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases hide caption

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Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases

Simone Groper got her flu shot in January at a Walgreens pharmacy in San Francisco. Flu season will likely last a few more weeks, health officials say, and immunization can still minimize your chances of getting seriously sick. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

Health and Human Services Secretary Alex Azar faced questions Wednesday from the House Ways and Means Committee about Idaho's move. Jacquelyn Martin/AP hide caption

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Jacquelyn Martin/AP