Tiny eel-like creatures called conodonts, which lived 500 million years ago, had teeth with tips just two micrometers wide—about

Australia is wider than the moon. The moon has a diameter of roughly 3,475 km, while Australia stretches about 4,000 km from east to west.

Sharks are older than trees. Sharks have existed for about 400 million years, while the first trees appeared roughly 350 million years ago.

hubert jenkins resvoir II