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  1. Materials Science

    Eggshell nanostructure protects a chick and helps it hatch

    The nanoscale structure of a chicken eggshell changes to fulfill different functions as the egg incubates.

    By Laurel Hamers
  2. Animals

    Toxins from the world’s longest animal can kill cockroaches

    Bootlace worms can stretch up to 55 meters long and ooze toxins that can kill cockroaches and green crabs.

    By Susan Milius
  3. Animals

    Some frogs may be bouncing back after killer chytrid fungus

    Frogs in Panama may be developing defenses against a fatal skin disease, a new study suggests.

    By Susan Milius
  4. Life

    Why cracking your knuckles can be so noisy

    Knuckles crack due to the partial collapse of bubbles in joint fluid, a new study suggests.