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  1. Plants

    Rats with poisonous hairdos live surprisingly sociable private lives

    Deadly, swaggering rodents purr and snuggle when they’re with mates and young.

    By Susan Milius
  2. Paleontology

    Newborn megalodon sharks were larger than most adult humans

    Preserved pieces of backbone suggest that megalodon sharks were about 2 meters long at birth.

    By Carolyn Gramling
  3. Neuroscience

    Mice may ‘catch’ each other’s pain — and pain relief

    Healthy mice mirror a companion’s pain or morphine-induced relief. Disrupting certain connections in the brain turns off such empathetic behaviors.

    By Carolyn Wilke
  4. Animals

    Brown tree snakes use their tails as lassos to climb wide trees

    A never-before-seen climbing technique could inspire the creation of new serpentine robots to navigate difficult terrains.