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    Most New York City Schools Had High Lead Levels, Retests Find


    In a second round of water testing, 83 percent of school buildings had at least one outlet with levels above the E.P.A.’s threshold for...

    In a second round of water testing, 83 percent of school buildings had at least one outlet with levels above the E.P.A.’s threshold for action.
    Court Gives Trump Small Victory in Push Against Clean Power Plan

    Court Gives Trump Small Victory in Push Against Clean Power Plan


    Rail cars containing coal in Williamson, W.Va., last year. An appeals court granted a request from the Trump administration to defer a decision on litigation over a contested Environmental Protection Agency regulation known as the Clean Power...

    An appeals court said it would delay a decision on the legality of the rule, which aims to tackle global warming by cutting emissions from coal-fired plants.
    Trilobites: 6 Bots That Deliver Science and Serendipity on Twitter

    Trilobites: 6 Bots That Deliver Science and Serendipity on Twitter


    An image from the Twitter account @mothgenerator, a bot that generates intricate images of imaginary moths and names...

    Not all bots on Twitter are out to spam, hack or misinform you. These science-themed bots dole out humor, factual information and galactic perspective.
    Gary Steigman, Who Teased Out the Universe’s Dark Secrets, Dies at 76

    Gary Steigman, Who Teased Out the Universe’s Dark Secrets, Dies at 76


    Gary Steigman in an undated photo. Dr. Steigman was one of the ringleaders of cosmology in an era in which astronomy and particle physics were...

    Dr. Steigman helped show that most matter in the universe was not made of atoms, a finding that led to modern conceptions of dark matter and dark energy.
    Leonard Reiffel, Who Studied Lunar Nuclear Bomb, Dies at 89

    Leonard Reiffel, Who Studied Lunar Nuclear Bomb, Dies at 89


    Leonard Reiffel at the Illinois Institute of Technology in 1963. In 1959, he helped write a report at the request of the Air Force on a proposal to detonate a nuclear warhead on or near the...

    Dr. Reiffel revealed that the Air Force had been interested in staging a surprise explosion on or near the moon, and that its goal was propaganda.
    Hunting Mushrooms, and What Makes Some Glow in the Dark

    Hunting Mushrooms, and What Makes Some Glow in the Dark


    A bioluminescent jack-o’-lantern mushroom found in Pisgah National Forest, near Asheville,...

    Scientists may have had more luck tracking down how some fungi glow than you may have hunting bioluminescent mushrooms, a reporter discovered.
    No Bones About It: Scientists Recover Ancient DNA From Cave Dirt

    No Bones About It: Scientists Recover Ancient DNA From Cave Dirt


    Clockwise from top left, Richard Roberts, Vladimir Ulianov and Maxim Kozlikin planned the sampling of sediments in the East Chamber of Denisova Cave,...

    With a new technique, German researchers isolated Neanderthal and Denisovan DNA from sediment alone, opening new possibilities in archaeology.
    Mass Die-Off of Whales in Atlantic Is Being Investigated

    Mass Die-Off of Whales in Atlantic Is Being Investigated


    Workers inspecting a dead humpback whale that washed up on Rockaway Beach in Queens this...

    Officials are seeking the reason for an “unusual mortality event” that has left 41 humpback whales dead since early 2016 from North Carolina to Maine.
    Q&A: A Dry Side Effect

    Q&A: A Dry Side Effect


    Dry mouth, also called xerostomia, is a frequent side effect of many commonly prescribed...

    Dry mouth, also called xerostomia, is a frequent side effect of many commonly prescribed drugs.
    No Longer a Dream: Silicon Valley Takes On the Flying Car

    No Longer a Dream: Silicon Valley Takes On the Flying Car


    The Kitty Hawk Flyer is one of several prototypes being designed by Kitty Hawk, a start-up based in Mountain View,...

    This isn’t science fiction. A number of start-ups as well as big aerospace firms are trying to build personal aircraft you could fly around town.
    Anthem Threatens to Leave Health Exchanges if Subsidies Are Halted

    Anthem Threatens to Leave Health Exchanges if Subsidies Are Halted


    Joseph R. Swedish, the chief executive of the health insurer Anthem, in 2015. He warned that a halt of subsidies to help low-income people “would cause further market...

    The insurer’s earnings beat expectations, but it warned it could withdraw from some marketplaces or raise rates if the government does not continue co-payment subsidies for low-income people.
    Renée Fleming and Joshua Bell to Unite for Science

    Renée Fleming and Joshua Bell to Unite for Science


    Brian Greene, during “Awakening the Mind: A Celebration of the Life and Work of Oliver Sacks,” at last year’s World Science...

    The musicians will perform in “Time, Creativity and the Cosmos,” a multimedia spectacle, to open the World Science Festival’s 10th anniversary.
    What Is the Antiquities Act and Why Does President Trump Want to Change It?

    What Is the Antiquities Act and Why Does President Trump Want to Change It?


    The northernmost boundary of the Bears Ears National Monument, along the Colorado River, in southeastern Utah is one of the national monuments to be reviewed by the Interior...

    The 1906 law, enacted under Theodore Roosevelt, has been used by presidents to protect vast tracts of public land from development and exploitation.
    As Rising Seas Erode Shorelines, Tasmania Shows What Can Be Lost

    As Rising Seas Erode Shorelines, Tasmania Shows What Can Be Lost


    Graves on Isle of the Dead in Tasmania. The island on which the graveyard lies, part of the Port Arthur Historic Sites, is being chewed away by the...

    Port Arthur, the famous prison that housed the British Empire’s toughest convicts in the 19th century, is facing an onslaught from the sea.
    Trilobites: Some Surprising Dog Breeds Have Ancient American Heritage

    Trilobites: Some Surprising Dog Breeds Have Ancient American Heritage


    Rascal Deux, a Chinese crested dog, competing in the World’s Ugliest Dog contest last year. Scientists reported Tuesday that the breed is one of a handful that trace part of their ancestry to the first dogs in the Americas 10,000 or more years...

    A new study of 161 breeds traces some ancestry back to the Americas of 10,000 years ago.
    That Ghostly, Glowing Light Above Canada? It’s Just Steve

    That Ghostly, Glowing Light Above Canada? It’s Just Steve


    A stream of hot, fast-moving gas, nicknamed Steve, glowing over Porteau Cove Provincial Park in British Columbia, Canada, in May...

    Scientists are investigating a stream of hot, bright gas visible not far from the northern lights. Amateurs saw it first, and they gave it a name from a 2006 animated movie.
    Watching Their Dust: Photographing Players in Pollination

    Watching Their Dust: Photographing Players in Pollination


    The white sweet lip of the Darwin’s slipper flower. When the lips are eaten by least seedsnipes, pollen is deposited on their...

    In “Pollination Power,” Heather Angel, a wildlife photographer, exposes the pollination process in macrophotography, showing the clear transfer of pollen onto creatures.
    Basics: As Rains Ease in the West, Cactuses Shine Brighter Than Ever

    Basics: As Rains Ease in the West, Cactuses Shine Brighter Than Ever


    Each teddy bear cholla is unique. This species of cactus releases pads and barbs that are carried on the wind to patches of soil where they will take root and...

    Never has there been a better time to appreciate the gritty, bizarre charm of these prickly natives.
    Video Games Help Model Brain’s Neurons

    Video Games Help Model Brain’s Neurons


    The results from “Mozak” have a higher degree of accuracy than conventional computer-based modeling...

    A video game is being used to help understand the structure of neurons, which could aid in treatment of diseases like Alzheimer’s or Parkinson’s.

    Peggy Whitson Breaks Another Record in Space


    The astronaut Peggy Whitson on Monday surpassed the 534-day record for most time in space by an American. Throughout her career, she has paved the way for women in space...

    The astronaut Peggy Whitson on Monday surpassed the 534-day record for most time in space by an American. Throughout her career, she has paved the way for women in space exploration.

    Trump Calls @AstroPeggy at the International Space Station


    Ivanka Trump joined the call, in which the president congratulated Peggy Whitson for setting a new U.S. space...

    Ivanka Trump joined the call, in which the president congratulated Peggy Whitson for setting a new U.S. space record.
    DNA Tests, and Sometimes Surprising Results

    DNA Tests, and Sometimes Surprising Results


    Students at West Chester University in Pennsylvania have volunteered to take part in ancestry DNA testing. Anita Foeman, a communications professor, says she has found that conversations around race are “complicated and...

    Think you know your racial background? A communications studies project involving ancestry DNA testing has led to interesting conversations on identity.

    Meet Three Scientists Ready to March


    Shadow three scientists as they work with wolves and butterflies, DNA and tide pools before they attend one of the March for Science demonstrations around the...

    Shadow three scientists as they work with wolves and butterflies, DNA and tide pools before they attend one of the March for Science demonstrations around the country.