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Your search has returned 83316 articles:
  • 50 Years Ago

    50 years ago, continental drift began to gain acceptance

    Drifting theories shake up geology

    Continental drift, a theory often considered amusing but rarely important, seems about to become the focus of a revolution in geology. At the least, it has already split the geological community into those who find the evidence for it “formidable” and those who think it is not yet formidable enough to constitute a proof. — Science News, April 29, 1967...

    04/20/2017 - 09:00 Earth
  • Science & the Public

    March for Science will take scientists’ activism to a new level

    Lab coats aren’t typical garb for mass demonstrations, but they may be on full display April 22. That’s when thousands of scientists, science advocates and science-friendly citizens are expected to flood the streets in the March for Science. Billed by organizers as both a celebration of science and part of a movement to defend science’s vital role in society, the event will include rallies and...

    04/19/2017 - 16:03 Science & Society
  • Feature

    There’s still a lot we don’t know about the proton

    Nuclear physicist Evangeline Downie hadn’t planned to study one of the thorniest puzzles of the proton.

    But when opportunity knocked, Downie couldn’t say no. “It’s the proton,” she exclaims. The mysteries that still swirl around this jewel of the subatomic realm were too tantalizing to resist. The plentiful particles make up much of the visible matter in the universe. “We’re made of them...

    04/18/2017 - 08:00 Physics, Particle Physics, Quantum Physics
  • 50 Years Ago

    50 years ago, contraception options focused on women

    Next in birth control

    The pill is a sledgehammer approach to contraception.... A second-generation of [drugs] is being designed to do the job without upsetting a woman’s normal cycle of ovulation and menstruation.... A contraceptive administered to the man can be given only for a short time without actually affecting the development of sperm … and, therefore, is not being considered for...

    04/06/2017 - 07:00 Health, Biomedicine, Science & Society
  • For Daily Use

    Spray-on mosquito repellents are more effective than other devices

    Mosquitoes are more than an itchy nuisance. They can carry serious diseases, including Zika, West Nile, yellow fever and chikungunya. Now after testing 11 types of mosquito repellents, researchers say they’ve identified the products most effective at warding off the bloodsuckers.

    Spray-on repellents with DEET or a refined tree extract called oil of lemon eucalyptus are most likely to...

    03/28/2017 - 13:00 Health
  • 50 Years Ago

    In 1967, LSD was briefly labeled a breaker of chromosomes

    LSD may damage chromosomes

    Two New York researchers have found the hallucinogenic drug will markedly increase the rate of abnormal change in chromosomes. [Scientists] tested LSD on cell cultures from the blood of two healthy individuals … [and] also found similar abnormal changes in the blood of a schizophrenic patient who had been treated with [LSD]. The cell cultures showed a two-fold...

    03/23/2017 - 07:00 Genetics, Neuroscience
  • Letters to the Editor

    Readers question supernova physics

    Supernova surprise

    Astronomers continue to learn a lot from supernova 1987A, which burst onto the scene 30 years ago. Thanks to new detectors that can pick up neutrino signals and even gravitational waves, scientists will be ready when the next nearby star explodes, Emily Conover reported in “Waiting for a supernova” (SN: 2/18/17, p. 24).

    Steve Capps wondered how neutrinos inside an...

    03/22/2017 - 12:10 Particle Physics, Robotics, Condensed Matter
  • News in Brief

    Life on Earth may have begun as dividing droplets

    NEW ORLEANS — In a primordial soup on ancient Earth, droplets of chemicals may have paved the way for the first cells. Shape-shifting droplets split, grow and split again in new computer simulations. The result indicates that simple chemical blobs can exhibit replication, one of the most basic properties of life, physicist Rabea Seyboldt of the Max Planck Institute for the Physics of Complex...

    03/21/2017 - 07:00 Biophysics, Chemistry
  • News

    Astronomers detect oldest known stardust in distant galaxy

    Astronomers may have spotted some of the earliest stardust ever created in the cosmos.

    Astrophysicist Nicolas Laporte of University College London and colleagues detected the dust in a galaxy seen as it was when the universe was only 600 million years old. “We are probably seeing the first stardust of the universe,” Laporte says. The observations, published online March 8 in the...

    03/08/2017 - 06:00 Astronomy, Cosmology
  • 50 Years Ago

    Origin of photosynthesis may go further back than estimates from 50 years ago

    Evidence of Precambrian life

    From deep in the gold mines of South Africa’s Orange Free State has come evidence that there was some form of biologic activity on Earth at least 2.15 billion years ago. Polymerized hydrocarbon “chemo-fossils” found in the gold ores … [probably] were originally part of a rich bacterial and algal life in the Witwatersrand basin. Since the rock layers from...

    03/02/2017 - 12:00 Evolution, Microbes