Uncategorized

  1. Physics

    Dissolving a puzzle

    A mathematical analysis shows what it takes to remove rock fast enough to create a cavern.

    By Alexandra Witze
  2. Chemistry

    The nitty-gritty of diamond polishing

    Researchers figure out what happens at the atomic scale when jewelers polish the hardest substance known.

    By Rachel Ehrenberg
  3. Humans

    Vitamin D targets increased

    A panel advises raising the dietary allowance for the nutrient, but some scientists say the new recommendations are still woefully low.

    By Nathan Seppa
  4. Humans

    World could heat up 4 degrees C in 50 years

    Immediate and substantial action to reduce emissions would be needed to meet climate negotiators' goal of holding warming to a 2 degree Celsius increase, a new package of scientific papers concludes.