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E.g., 02/25/2018
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Your search has returned 22048 articles:
  • Letters to the Editor

    Readers weigh in on human gene editing and more

    Mission: Mars

    The possibility that human visitors could carry Earth-based microbes to the Red Planet has roiled the Mars research community, Lisa Grossman reported in “How to keep humans from ruining the search for life on Mars” (SN: 1/20/18, p. 22).

    Reader Bruce Merchant speculated that Mars would need a protective global magnetic field to sustain a life-friendly environment. But...

    02/22/2018 - 10:39 Planetary Science, Exoplanets, Science & Society
  • 50 years ago, early organ transplants brought triumph and tragedy

    Kidneys lead the field

    While the drama of human heart transplants has grasped the public interest, kidney transplants are ahead in the field…. Although only three little girls are now surviving liver transplants, the liver is a promising field for replacement…. The donor, of course, must be dead; no one can live without his liver. — Science News, March 2, 1968

    Update

    Kidney...

    02/22/2018 - 07:00 Health
  • Feature

    New fossils are redefining what makes a dinosaur

    “There’s a very faint dimple here,” Sterling Nesbitt says, holding up a palm-sized fossil to the light. The fossil, a pelvic bone, belonged to a creature called Teleocrater rhadinus. The slender, 2-meter-long reptile ran on all fours and lived 245 million years ago, about 10 million to 15 million years before scientists think dinosaurs first appeared.

    Nesbitt, a paleontologist at...

    02/21/2018 - 16:00 Paleontology, Evolution
  • Growth Curve

    A new study eases fears of a link between autism and prenatal ultrasounds

    Ultrasounds during pregnancy can be lots of fun, offering peeks at the baby-to-be. But ultrasounds aren’t just a way to get Facebook fodder. They are medical procedures that involve sound waves, technology that could, in theory, affect a growing fetus.

    With that concern in mind, some researchers have wondered if the rising rates of autism diagnoses could have anything to do with the...

    02/21/2018 - 07:00 Pregnancy, Health
  • Feature

    How to build a human brain

    In a white lab coat and blue latex gloves, Neda Vishlaghi peers through a light microscope at six milky-white blobs. Each is about the size of a couscous grain, bathed in the pale orange broth of a petri dish. With tweezers in one hand and surgical scissors in the other, she deftly snips one tiny clump in half.

    When growing human brains, sometimes you need to do some pruning.

    The...

    02/20/2018 - 15:30 Human Development
  • It's Alive

    The flowers that give us chocolate are ridiculously hard to pollinate

    It’s a wonder we have chocolate at all. Talk about persnickety, difficult flowers.

    Arguably some of the most important seeds on the planet — they give us candy bars and hot cocoa, after all — come from pods created by dime-sized flowers on cacao trees. Yet those flowers make pollination just barely possible.

    Growers of commercial fruit crops expect 50 to 60 percent of flowers to...

    02/20/2018 - 07:00 Plants, Animals, Agriculture
  • Exhibit

    Modern tech unravels mysteries of Egyptian mummy portraits

    Everybody’s a critic. Even back in second century Egypt.

    While digging in Tebtunis in northern Egypt in the winter of 1899–1900, British archaeologists stumbled upon portraits of affluent Greco-Egyptians placed over the faces of mummies. One grave contained an ink and chalk sketch, a bit larger than a standard sheet of printer paper, of a woman from around the years A.D. 140 to 160. The...

    02/19/2018 - 08:00 Archaeology, Technology, Science & Society
  • News

    What will it take to go to Venus?

    There’s a planet just next door that could explain the origins of life in the universe. It was probably once covered in oceans (SN Online: 8/1/17). It may have been habitable for billions of years (SN Online: 8/26/16). Astronomers are desperate to land spacecraft there.

    No, not Mars. That tantalizing planet is Venus. But despite all its appeal, Venus is one of the hardest places in the...

    02/13/2018 - 07:00 Planetary Science, Exoplanets
  • Context

    Top 10 papers from Physical Review’s first 125 years

    No anniversary list is ever complete. Just last month, for instance, my Top 10 scientific anniversaries of 2018 omitted the publication two centuries ago of Mary Shelley’s Frankenstein. It should have at least received honorable mention.

    Perhaps more egregious, though, was overlooking the 125th anniversary of the physics journal Physical Review. Since 1893, the Physical Review has...

    02/08/2018 - 11:00 History of Science
  • News

    Scientists are tracking how the flu moves through a college campus

    COLLEGE PARK, Md. — Campus life typically challenges students with new opportunities for learning, discovery — and intimacy with germs. Lots of germs.

    That makes dormitories and their residents an ideal natural experiment to trace the germs’ paths. “You pack a bunch of college kids into a very small environment … we’re not known as being the cleanliest of people,” says sophomore Parker...

    02/07/2018 - 07:00 Biomedicine, Health