News

  1. Genetics

    Number of species depends how you count them

    Genetic evidence alone may overestimate numbers of species, researchers warn.

    By Tina Hesman Saey
  2. Astronomy

    Middling black hole may be hiding in star cluster

    A black hole with about 2,200 times the mass of the sun has been detected. If confirmed, it could represent a new type of gas-starved black holes and hint at how supermassive ones may form.

    By Ashley Yeager
  3. Climate

    Hot nests, not vanishing males, are bigger sea turtle threat

    Climate change overheating sea turtle nestlings may be a greater danger than temperature-induced shifts in their sex ratios.

    By Susan Milius
  4. Psychology

    Long-lasting mental health isn’t normal

    Those who stay mentally healthy from childhood to middle age are exceptions to the rule.