Australia and South America weren't always so separate. At one time, many millions of years ago, these two continents were connected, along with others, in the southern supercontinent of Gondwana.

Humans are forever trying to get their rear ends to look either smaller or bigger, but nothing we do—nothing—can make our cabooses as amazing as that of the Cuyaba dwarf frog, or Physalaemus nattereri ...