Vol. 188 No. 9
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More Stories from the October 31, 2015 issue

  1. Physics

    Raw chicken, ingenuity make a time-reversal mirror

    A new phase-conjugation mirror sends light waves back where they came from, allowing physicists to reconstruct images even if the original light was severely scrambled.

  2. Life

    For people, mealtime is all the time

    People eat for most of their waking hours, which may affect sleep and weight.

  3. Paleontology

    New dinosaur identified in Alaska

    New species of duck-billed dinosaur discovered in the Alaskan permafrost.

  4. Health & Medicine

    What makes cells stop dividing and growing

    Scientists have found that the protein GATA4 helps control cellular senescence, and may be a target for treating aging-related diseases.

  5. Chemistry

    Elusive acid finally created

    Cyanoform, a chemical sought for more than a century and written into textbooks, is one of the strongest organic acids.

  6. Math

    83-year-old math problem solved

    An 83-year-old math problem concerning sequences of 1s and –1s has been solved.

  7. Planetary Science

    Mysterious circles appear, grow on comet

    The Rosetta spacecraft caught five circular depressions quickly spreading across a region of comet 67P.

  8. Planetary Science

    67P reveals recipe for a comet

    Rosetta’s comet 67P probably started out as two smaller comets.

  9. Animals

    Math describes sheep herd fluctuations

    Scientists have developed equations to describe the motion of a herd of sheep.

  10. Animals

    Lights at night trick wild wallabies into breeding late

    Artificial lighting is driving wild tammar wallabies to breed out of sync with peak season for food

  11. Anthropology

    Bronze Age mummies identified in Britain

    Bone analysis finds widespread mummy making in ancient England and Scotland.

  12. Genetics

    Brain cells’ DNA differs

    Every nerve cell may hold different DNA, a new study suggests.

  13. Earth

    Giant asteroid may have triggered deadly volcano eruptions

    Increased volcanic eruptions coincided much more closely with an asteroid impact and the extinction of the dinosaurs than previously believed, a new study suggests.

  14. Animals

    How to drink like a bat

    Some bats stick out their tongues and throbs carry nectar to their mouths.

  15. Anthropology

    Ancient hominid ears were tuned to high frequencies

    Two ancient hominid species may have heard high-frequency sounds especially well.

  16. Planetary Science

    Salt streaks point to present-day water flows on Mars

    Salt deposits on Mars hint at contemporary seasonal water flows on the Red Planet.

  17. Health & Medicine

    Sperm protein may offer target for male contraceptive

    With the identification of a new sperm protein that helps sperm penetrate eggs, researchers may be closer to developing birth control pills for men.

  18. Neuroscience

    Adolescent brains open to change

    Adolescent brains are still changing, a malleability that renders them particularly sensitive to the outside world.

  19. Plants

    Early cyanobacteria fossils dug up in 1965

    In 1965, early photosynthetic plant fossils were discovered. The date of earliest oxygen-producing life forms has since been pushed much earlier.

  20. Animals

    Marine biologist chronicles a lifelong love of fishing

    In A Naturalist Goes Fishing, a marine biologist takes readers on a round-the-world fishing expedition

  21. Health & Medicine

    Hollywood-made science documentary series comes to TV

    Breakthrough series gives a closer look at scientists at work.

  22. Chemistry

    Zippy videos teach chemistry behind everyday life

    The American Chemical Society breaks down complex reactions of everyday life in zippy online video clips.

  23. Science & Society

    Nobels note neutrinos, DNA, drugs

    The Nobel Prizes in physics, chemistry and physiology or medicine ran the gamut this year, honoring both fundamental science discoveries and research with real-world impacts.