Spectacular tropical clownfish who live around ocean coral reefs rely heavily on their hearing, say scientists. It helps them find a mate, forage for food, and crucially avoid predators lurking in the depths.
Smallpox was eradicated in 1979 - but two stocks of live smallpox virus remain. For years the debate over what to do with them has raged - in Geneva developing countries argued it was high time to destroy all known samples of a virus which in the past claimed millions of lives.
The researchers claim to have found 10 dark gas giants floating at the heart of our Milky Way without any nearby star to illuminate them. Astronomers have long suspected such rogue planets existed, but this is the first evidence.