The Helix Nebula is an example of a planetary nebula. Though it looks like a bubble or eye from Earth’s point of view, the Helix is actually a trillion-mile-long tunnel of glowing gases. In its center ...
On this week's episode: ancient human ancestors didn't eat meat, carbon caught in a cosmic conveyer belt, robotic bees pollinating crops, and the incredibly rare marsupial mole gets a checkup.