Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

  1. Brain

    Explainer: What is dopamine?

    Dopamine is a chemical messenger that carries signals between brain cells. It also gets blamed for addiction. And a shortage of it gets blamed for symptoms of diseases such as Parkinson’s.

  2. Health & Medicine

    Seven tips for staying safe in frigid weather

    Maps? Check. Water? Check. Insulating clothes? Check. Here’s the checklist to consult before planning to trek out in the frigid cold.

  3. Oceans

    Creative ways to help coral reefs recover

    Coral reefs are under siege from threats ranging from climate change to explosives. But scientists are developing ways to rebuild reefs before they disappear.

  4. Brain

    Pain is contagious — at least in mice

    Pain can move from one mouse to another. The trigger may be smell.

  5. Life

    Nobel awarded for unveiling how cells recycle their trash

    Cell biologist Yoshinori Ohsumi has won the 2016 Nobel Prize for physiology or medicine for discovering how cells take care of housekeeping.

  6. Health & Medicine

    Zebra finches can ‘drink’ water from their own fat

    When water is scarce, thirsty zebra finches can produce their own water. They do it by breaking down their body fat.

  7. Brain

    Mice brains hint at how bodies keep their cool

    Nerve cells in mice can keep the body cool and may prevent high fevers. The discovery could have implications for obesity and other health issues.

  8. Genetics

    How fake sugar can lead to overeating

    Scientists have found that fruit flies and mice eat more after consuming food laced with a popular fake sugar.

  9. Genetics

    Scientists Say: DNA sequencing

    All of us have our own individual DNA. Now, scientists can determine what each individual strand is made of — a process called DNA sequencing.

  10. Brain

    Hormone affects how teens’ brains control emotions

    Using scans of brain activity, scientists show that surging hormones drive where emotions get processed in a teen’s brain.

  11. 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.

  12. Health & Medicine

    Adult diseases may be linked to childhood weight

    Danish scientists find that very overweight kids grow up with a heightened risk of colon cancer and stroke.