Evaluate the evidence for the role of group behavior on individual and species' chances to survive and reproduce.

  1. Animals

    Bee underfeeds eldest daughter, creating ‘nursemaid’

    By giving a brood’s firstborn female smaller portions and a low-protein diet, a mother bee can turn the offspring into a nursemaid for her younger siblings.

  2. Microbes

    Mouth germs team up to boost disease risk

    The oxygen given off by harmless mouth bacteria can help disease-causing invaders grow strong and flourish.

  3. Agriculture

    Sneaky! Virus sickens plants, but helps them multiply

    The cucumber mosaic virus helps tomato plants lure pollinators. When the plants multiply, the virus now gets new hosts.

  4. Microbes

    Staph infections? The nose knows how to fight them

    Bacteria living in some people’s noses make a compound that could help fight a nasty type of infection that laughs at other antibiotics.

  5. Genetics

    GM mosquitoes cut rate of viral disease in Brazil

    Adults males carrying the altered gene cannot father young that survive to adulthood. That’s when they suck blood — and can transmit disease.

  6. Plants

    Climate closing the gender gap for this mountain flower

    Among valerian plants, males like it hotter than the females do. So a warming climate has been speeding their migration up once-cool mountainsides.

  7. Animals

    Frigate birds spend months without landing

    Frigate birds can fly non-stop for months. They stay in the air with the help of upward-moving airflows, a new study finds.

  8. Environment

    Scientists Say: Poisonous

    A poison-arrow frog is poisonous, but a rattlesnake is not. What’s the difference? It’s how the poison is delivered.

  9. Animals

    This mammal has the world’s slowest metabolism

    A sloth species manages to exist with a super-slow metabolism by moving little and using its environment for heating and cooling its body.

  10. Chemistry

    Scientists Say: Toxin

    It is safe to refer to any poison as toxic. But while all toxins are poisonous, most poisons are not toxins.

  11. Animals

    Singing lemurs sync up — until one goes solo

    The indri lemurs of Madagascar sing in chorus to mark their territory. But young males sometimes solo, which may help them attract a mate.

  12. Animals

    Leapin’ eels! Video shows they attack with zaps

    When a predator threatens an electric eel from above, the animals leap up to deliver a shocking defense.