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E.g., 01/17/2018
E.g., 01/17/2018
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  • News

    Evidence grows that normal childbirth takes longer than we thought

    A long-standing “rule” for women in labor has been challenged again.

    During labor, the cervix – the narrow, lower part of the uterus – dilates, or opens, to allow for a baby’s birth. For decades, the guidance has been that the cervix should dilate by at least 1 centimeter per hour. But a study in two African countries found a slower rate of dilation for many women who went on to have...

    01/16/2018 - 14:49 Health
  • Context

    Speed of universe’s expansion remains elusive

    Unless you are a recent arrival from another universe, you’ve no doubt heard that this one is expanding. It’s getting bigger all the time. What’s more, its growth rate is accelerating. Every day, the universe expands a little bit faster than it did the day before.

    Those day-to-day differences are negligible, though, for astronomers trying to measure the universe’s expansion rate. They...

    01/16/2018 - 12:52 Astronomy, History of Science
  • News

    DNA solves the mystery of how these mummies were related

    A pair of ancient Egyptian mummies, known for more than a century as the Two Brothers, were actually half brothers, a new study of their DNA finds.

    These two, high-ranking men shared a mother, but had different fathers, say archaeogeneticist Konstantina Drosou of the University of Manchester in England and her colleagues. That muted family tie came to light thanks to the successful...

    01/16/2018 - 07:00 Anthropology, Archaeology
  • News

    Tiny scales in ancient lagoon may be the first fossil evidence of the moth-butterfly line

    Newly described little scaly bits could push back the fossil record of the moth-and-butterfly branch on the tree of life by some 70 million years. That raises the question of whether the drinking-straw mouthparts evolved long before the flower nectar many drink today.

    The microscopic ridged scales date from roughly 200 million years ago, around the time of one of Earth’s less famous mass...

    01/15/2018 - 07:00 Paleontology, Evolution, Animals
  • News in Brief

    Spaceships could use blinking dead stars to chart their way

    OXON HILL, Md. — Future spacecraft could navigate by the light of dead stars.

    Using only the timing of radiation bursts from pulsating stellar corpses, an experiment on the International Space Station was able to pinpoint its location in space in a first-ever demonstration. The technique operates like a stellar version of GPS, researchers with the Station Explorer for X-ray Timing and...

    01/12/2018 - 17:15 Astronomy
  • News

    Trio of dead stars upholds a key part of Einstein’s theory of gravity

    OXON HILL, Md. — Observations of a trio of dead stars have confirmed that a foundation of Einstein’s gravitational theory holds even for ultradense objects with strong gravitational fields.

    The complex orbital dance of the three former stars conforms to a rule known as the strong equivalence principle, researchers reported January 10 at a meeting of the American Astronomical Society....

    01/12/2018 - 16:19 Astronomy, Physics
  • News

    Pollution is endangering the future of astronomy

    OXON HILL, Md. — Even as technological advances allow astronomers to peer more deeply into the cosmos than ever before, new technologies also have the potential to create blinding pollution.

    Three sources of pollution — space debris, radio interference and light pollution — already are particularly worrisome. And the situation is getting worse. In the next two decades, as many as 20,000...

    01/12/2018 - 13:27 Astronomy, Pollution, Technology
  • Science Ticker

    See a 360-degree visualization of the center of the Milky Way

    View the video

    OXON HILL, Md. — Ever wonder what it would be like to sit at the center of the Milky Way and watch the galaxy swirl by? A video debuted in a January 10 news conference at the American Astronomical Society Meeting provides a glimpse.

    The 360-degree-simulation, made with data from several telescopes, including NASA's Chandra X-ray Observatory and the European Southern...

    01/12/2018 - 06:00 Astronomy
  • Introducing

    18 new species of pelican spiders discovered

    Despite their name, pelican spiders aren’t massive, fish-eating monstrosities. In fact, the shy spiders in the family Archaeidae are as long as a grain of rice and are a threat only to other spiders.

    Discovering a new species of these tiny Madagascar spiders is tough, but Hannah Wood has done just that — 18 times over.

    Wood, an arachnologist at the Smithsonian National Museum of...

    01/11/2018 - 18:15 Animals, Ecology
  • News

    Rising CO2 in lakes could keep water fleas from raising their spiky defenses

    Rising carbon dioxide levels could leave some tiny lake dwellers defenseless. Like the oceans, some lakes are experiencing increasing levels of the greenhouse gas, a new study shows. And too much CO2 in the water may leave water fleas, an important part of many lake food webs, too sleepy to fend off predators.

    Detailed observations of lake chemistry over long periods of time are rare....

    01/11/2018 - 16:29 Climate, Ecology