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E.g., 11/21/2017
E.g., 11/21/2017
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  • News

    This material does weird things under pressure

    View the video

    A newly fabricated material does more than just hold up under pressure. Unlike many ordinary objects that shrink when squeezed, the metamaterial — a synthetic structure designed to exhibit properties not typically found in natural materials — expands at higher pressures.

    This counterintuitive material is made up of a grid of hollow 3-D crosses — shaped like six-way...

    11/20/2017 - 09:00 Materials, Technology
  • News

    Study casts doubt on whether adult brain’s memory-forming region makes new cells

    In stark contrast to earlier findings, adults do not produce new nerve cells in a brain area important to memory and navigation, scientists conclude after scrutinizing 54 human brains spanning the age spectrum.

    The finding is preliminary. But if confirmed, it would overturn the widely accepted and potentially powerful idea that in people, the memory-related hippocampus constantly churns...

    11/16/2017 - 06:00 Neuroscience
  • Feature

    How Asian nomadic herders built new Bronze Age cultures

    Nomadic herders living on western Asia’s hilly grasslands made a couple of big moves east and west around 5,000 years ago. These were not typical, back-and-forth treks from one seasonal grazing spot to another. These people blazed new trails.

    A technological revolution had transformed travel for ancient herders around that time. Of course they couldn’t make online hotel reservations....

    11/15/2017 - 12:00 Archaeology, Anthropology, Genetics
  • News

    New blood pressure guidelines put half of U.S. adults in unhealthy range

    ANAHEIM, Calif.  — Nearly half of U.S. adults now have high blood pressure, thanks to a new definition of what constitutes high: 130/80 is the new 140/90. That means that 103 million people — up  from 72 million under the old definition — need to make diet and exercise changes and, in some cases, take medication to lower their risk of heart attack or stroke.

    These new blood pressure...

    11/13/2017 - 19:01 Health
  • Introducing

    The Lord Howe stick insect is officially back from the dead

    It’s a rare triumph when a species comes back from the dead. A new genetic analysis has officially established what many entomologists and conservation biologists hoped was true: The Lord Howe stick insect (Dryococelus australis) lives.

    Nicknamed “tree lobsters,” the dark-brown crawlers are nocturnal, flightless creatures that can grow up to 15 centimeters long. They feed on tea trees,...

    11/13/2017 - 12:30 Animals, Conservation, Evolution
  • News

    Cholera pandemics are fueled by globe-trotting bacterial strains

    Cholera strains behind worldwide outbreaks of the deadly disease over the last five decades are jet-setters rather than homebodies.

    It had been proposed that these cholera epidemics were homegrown, driven by local strains of Vibrio cholerae living in aquatic ecosystems. But DNA fingerprints of the V. cholerae strains behind recent large outbreaks in Africa and Latin America were more...

    11/13/2017 - 07:00 Health
  • Science Visualized

    See these first-of-a-kind views of living human nerve cells

    The human brain is teeming with diversity. By plucking out delicate, live tissue during neurosurgery and then studying the resident cells, researchers have revealed a partial cast of neural characters that give rise to our thoughts, dreams and memories. 

    So far, researchers with the Allen Institute for Brain Science in Seattle have described the intricate shapes and electrical properties...

    11/09/2017 - 07:00 Neuroscience, Cells
  • News

    Human study supports theory on why dengue can be worse the next time around

    Et tu, antibody? In humans, dengue can be more severe the second time around. Now, a study implicates an immune system treachery as the culprit.

    The study suggests that the amount of anti-dengue antibodies a person has matters. In a 12-year study of Nicaraguan children, low levels of dengue antibodies left over in the blood from a prior infection increased the risk of getting a life-...

    11/08/2017 - 07:00 Health, Immune Science
  • Science Ticker

    NASA wants your help naming New Horizons’ next destination

    NASA’s New Horizons mission needs a catchier nickname for its next destination. The bar isn’t exactly high.

    On New Year’s Day 2019, the spacecraft will fly by the tiny Kuiper Belt world that bears the official designation of (486958) 2014 MU69. NASA announced Monday that it is asking the public for an easier-to-remember nickname. The SETI Institute is hosting the contest.

    As with...

    11/07/2017 - 14:00 Astronomy, Planetary Science
  • Growth Curve

    Let most babies eat food containing peanuts. Really.

    At the beginning of 2017, parents and pediatricians got new peanut guidelines that, for most kids, are very pro-peanut. My colleague and fellow mom Meghan Rosen wrote about the recommendations, issued from the National Institute of Allergy and Infectious Diseases.

    This “let them eat nuts” advice is based in part on a large and unusually clear dataset from a study that looked at babies at...

    11/07/2017 - 12:00 Guidelines, Health