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    In Health Bill’s Defeat, Medicaid Comes of Age

    In Health Bill’s Defeat, Medicaid Comes of Age


    President Lyndon B. Johnson signed the bill creating Medicare and Medicaid in 1965, with former President Harry S. Truman, who had tried to establish national health insurance, seated at...

    Medicaid now covers more Americans than Medicare, and it played a major role in stopping the Republican drive to repeal and replace the Affordable Care Act.
    Addiction Specialists Ponder a Potential Aid: Pot

    Addiction Specialists Ponder a Potential Aid: Pot


    Nikolas Michaud, 27, lighting a joint at High Sobriety in Los Angeles during treatment for heroin...

    Some clinicians think marijuana may help ease the transition out of addiction, while critics say substituting one drug for another is no solution.
    A Dream of Clean Energy at a Very High Price

    A Dream of Clean Energy at a Very High Price


    At the ITER construction site, immense slabs of concrete lie in a ring like a modern-day...

    If a fusion experiment in France succeeds, it could shape the power plants of the future and contribute greatly to reducing planet-warming emissions.
    Q&A: Recalling Early Childhood Memories, or Not

    Q&A: Recalling Early Childhood Memories, or Not


    Remembering events from no earlier than age 3½ or 4 is typical, studies have found. The phenomenon is known as childhood...

    Remembering events from no earlier than age 3½ or 4 is typical, studies have found. The phenomenon is known as childhood amnesia.

    ScienceTake: Wonders of a Marine National Monument


    A research cruise in the Pacific Remote Islands Marine National Monument produced video of alien-looking deep sea...

    A research cruise in the Pacific Remote Islands Marine National Monument produced video of alien-looking deep sea life.

    Wonders of the Deep


    The research vehicle Okeanos Explorer is collecting video and data from the Pacific Remote Islands Marine National...

    The research vehicle Okeanos Explorer is collecting video and data from the Pacific Remote Islands Marine National Monument.
    Editorial: The Trump Administration’s War on Science

    Editorial: The Trump Administration’s War on Science


    Mr. Trump’s inaugural budget blueprint is a narrow-minded document that sacrifices American innovation to small-bore...

    Mr. Trump’s inaugural budget blueprint is a narrow-minded document that sacrifices American innovation to small-bore politics.
    New Vaccine Could Slow Disease That Kills 600 Children a Day

    New Vaccine Could Slow Disease That Kills 600 Children a Day


    Laouli Houzeïnatou, 20, and her son, Hanissa Moustaphe, took part in the clinical study of the new vaccine. Laouli was monitored throughout her...

    A lower-cost vaccine provides strong protection against rotavirus, a diarrheal disease, and could be particularly useful in poorer countries, researchers said.

    Trilobites: Visualizing the Cosmic Streams That Spew Meteor Showers


    Researchers recorded more than 300,000 meteoroid trajectories since 2010 to depict the drifting paths of meteor showers that Earth passes...

    Researchers recorded more than 300,000 meteoroid trajectories since 2010 to depict the drifting paths of meteor showers that Earth passes through.
    A Space Odyssey: Making Art Up There

    A Space Odyssey: Making Art Up There


    The artwork “Inner Telescope,” floating in...

    The artist Eduardo Kac and Thomas Pesquet, a Frenchman on the International Space Station, have created art in space.
    Trilobites: Headed North, Sandhill Cranes Squeeze In Where They Can

    Trilobites: Headed North, Sandhill Cranes Squeeze In Where They Can


    Sandhill cranes on March 20 in the Platte River in Grand Island, Neb. The peak roosting period this year was March 8 through March...

    The Platte River in Nebraska is an important layover for hundreds of thousands of the birds as they head toward their summer homes.
    Bao Bao, an American-Born Panda, Steps Out in China

    Bao Bao, an American-Born Panda, Steps Out in China


    After 30 days of quarantine, the American-born Bao Bao appeared in public for the first time on Friday at her new home: the Dujiangyan Panda Base in the southwestern Chinese province of...

    Culture shock is fading, say the handlers of Bao Bao, the panda from the National Zoo in Washington, as she settles into the land of her ancestors.
    Dr. Lewis Rowland, Leading Neurologist on Nerve and Muscle Diseases, Dies at 91

    Dr. Lewis Rowland, Leading Neurologist on Nerve and Muscle Diseases, Dies at 91


    Dr. Lewis P. Rowland with residents at the University of Pennsylvania School of Medicine. In 1973, he went to Columbia, where he was chairman of the neurology department for 25 years, retiring in...

    Dr. Rowland, who had a special interest in A.L.S., or Lou Gehrig’s disease, refused to be interrogated by investigators in the McCarthy era.
    Trilobites: How Comet 67P’s Face Changed During Its Trip Around the Sun

    Trilobites: How Comet 67P’s Face Changed During Its Trip Around the Sun


    An image of Comet 67P/Churyumov-Gerasimenko taken by the Rosetta spacecraft in July 2015. The arrow indicates a plume that scientists believe was related to the collapse of a cliff on the comet’s...

    During the two years that the Rosetta spacecraft stalked the comet, it observed cliffs that collapsed, boulders that moved and eruptions of dust and gas.
    As Rivals Stand Silent, One Health Insurer Protests G.O.P. Plan

    As Rivals Stand Silent, One Health Insurer Protests G.O.P. Plan


    Dr. J. Mario Molina, chief executive of Molina Healthcare, with a portrait of his father, who founded the company. Dr. Molina has publicly criticized the House health care bill, which he says could strip away coverage for millions of clients and cause...

    Dr. J. Mario Molina, one of the few insurance executives to criticize the House bill publicly, says it could harm insurers and patients alike.
    Arctic’s Winter Sea Ice Drops to Its Lowest Recorded Level

    Arctic’s Winter Sea Ice Drops to Its Lowest Recorded Level


    A research plane surveying ice thickness in the Arctic in August. Much of the ice in the region appears to be thinner than...

    Much of the ice also appears to be thinner than normal — further signs of climate change’s effects on the region.
    Shaking Up the Dinosaur Family Tree

    Shaking Up the Dinosaur Family Tree


    The proposed new family tree of dinosaurs. The group to the left is for close relatives but not true dinosaurs. The old tree grouped the theropods, purple, with the Saurischia, green, and viewed the Saurischia and the Ornithischia as the two major...

    A Ph.D candidate and a computer program that took five minutes to run may upend the dinosaur classification system that has been used for more than a century.
    9 Deaths Are Linked to Rare Cancer From Breast Implants

    9 Deaths Are Linked to Rare Cancer From Breast Implants


    Anaplastic large-cell lymphoma is likelier to occur with textured implants, above, than with smooth implants, the F.D.A....

    The problem is more likely to occur with textured implants than with smooth implants, the F.D.A. said, and it is usually treatable and not often fatal.
    Trump Lays Plans to Reverse Obama’s Climate Change Legacy

    Trump Lays Plans to Reverse Obama’s Climate Change Legacy


    A coal-fired power plant in Ghent, Ky. President Trump is expected to order a withdrawal and rewriting of Obama-era regulations intended to shut down hundreds of heavily polluting coal-fired...

    The White House is preparing to dismantle major policy actions of the Obama era, including a plan to close hundreds of heavily polluting power plants.