Issue 50 / June 9, 2016

  1. Editor’s Note

    Issue 50: Lightning bugs, beating hearts, and golden spirals. /

  2. The Most Spectacular Firefly

    We’re drawn to animals that shine their own light. For one, it’s a group effort. /

  3. Mysteries of a Beating Heart

    We don’t really know how a heartbeat sparks to life. /

  4. The Eagle, the Shell, and the Sunflower

    The Golden Spiral appears all over nature. /

  5. Bright Angels

    “When I was growing up, / they were lightning bugs.” /

  6. Wonder on the Web

    Issue 50: Links to amazing stuff.