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Your search has returned 23 images:
  • illustration of astronauts on Mars
  • illustration of a woman
  • screenshot of Brainfacts.org
Your search has returned 50 articles:
  • Letters to the Editor

    Readers wrangle with definition of ‘species’

    Species shmecies

    In “Defining ‘species’ is a fuzzy art” (SN: 11/11/17, p. 22), Susan Milius asked scientists to define “species.” Schoolbooks may define the concept as a group of organisms that create fertile offspring when mating with each other but not when mating with outsiders. But for researchers specializing in the topic, a single definition is hard to come by.

    “It seems to me...

    01/10/2018 - 12:37 Evolution, Technology, Astronomy
  • Editor's Note

    We’ll be watching the skies, plus a lot more, this year

    If this issue is any clue, 2018 may be the Year of Space. Our pages are packed with a surprising wealth of content for astronomy lovers, and anyone who dreams of otherworldly encounters.

    In our cover story, astronomy writer Lisa Grossman reports on the race to Mars. SpaceX announced last year that it plans to get people to the Red Planet by 2024, but the battle over what humans’...

    01/10/2018 - 12:32 Science & Society, Astronomy, Climate
  • Feature

    How to keep humans from ruining the search for life on Mars

    T he Okarian rover was in trouble. The yellow Humvee was making slow progress across a frigid, otherworldly landscape when planetary scientist Pascal Lee felt the rover tilt backward. Out the windshield, Lee, director of NASA’s Haughton Mars Project, saw only sky. The rear treads had broken through a crack in the sea ice and were sinking into the cold water.

    True, there are signs of...

    01/10/2018 - 11:30 Planetary Science, Astrobiology
  • Feature

    Hormone replacement makes sense for some menopausal women

    Internist Gail Povar has many female patients making their way through menopause, some having a tougher time than others. Several women with similar stories stand out in her mind. Each came to Povar’s Silver Spring, Md., office within a year or two of stopping her period, complaining of frequent hot flashes and poor sleep at night. “They just felt exhausted all the time,” Povar says. “The joy...

    01/09/2018 - 14:00 Health
  • Screentime

    Website invites you to probe a 3-D human brain

    In movies, exploring the body up close often involves shrinking to microscopic sizes and taking harrowing rides through the blood. Thanks to a new virtual model, you can journey through a three-dimensional brain. No shrink ray required.

    The Society for Neuroscience and other organizations have long sponsored the website BrainFacts.org, which has basic information about how the human...

    01/09/2018 - 07:00 Neuroscience