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  1. Health & Medicine

    Cancer cells engineered with CRISPR slay their own kin

    Scientists can program the stealth cells to die before creating new tumors.

    By Laurel Hamers
  2. Archaeology

    Stone tools put early hominids in China 2.1 million years ago

    Newly discovered stone tools in China suggest hominids left Africa 250,000 years earlier than we thought.

    By Bruce Bower
  3. Ecosystems

    Bird poop helps keep coral reefs healthy, but rats are messing that up

    Eradicating invasive rats from islands may help boost numbers of seabirds, whose droppings provide nutrients to nearby coral reefs.

    By Leah Rosenbaum
  4. Particle Physics

    Readers ask about proton pressure, wearable tech and more

    Readers had questions about the pressure inside a proton, wearable tech safety and the effects of global warming on insects.