Notebook

  1. Health & Medicine

    One in 10 people with tattoos experience rashes, scarring or other problems

    Tattoos carry risk of long-term rash; red ink may be most irritating color.

    By Meghan Rosen
  2. Genetics

    Genes and environment balance each other

    Genes and environment have equal influence on human traits.

    By Tina Hesman Saey
  3. Astronomy

    Brightest galaxy discovered

    The brightest known galaxy is about 350 trillion times as bright as the sun, and a supermassive black hole is to blame.

    By Christopher Crockett
  4. Science & Society

    Here’s what game theory says about how to win in semifinals

    Game theory informs competitors facing off in a semifinal whether to go all out or save energy for the final.