Hosts: Ed Brown, Penny Dumsday, Lucas Randall.

Huge meteor blazes across the sky in Russia. A computation of what the last common ancestor of placental mammals looked like. A robot with artificial but transplantable organs goes on display. Why insects constantly clean their antennae. The self-assembling molecules that give clues to the origins of life. France moves to curb light pollution. Thousands of spiders crawling across the Brazilian sky.