Around 550 million to 540 million years ago, there was a remarkable explosion in the diversity and complexity of animal life on Earth.
Early dinosaurs were at the mercy of weather patterns unfolding across the supercontinent Pangaea.
Boehner has said his shift on marijuana is a change of heart, but it also coincides with his new company's plan to go public.
Scientists think the dinosaurs are showing off their genetic make-up.
Even among the giant viruses, these are weird.
"There are a lot of members of the church who aren't on board with evolution."
Magic mushrooms' hallucinogenic effects might keep insects away, but it doesn't stop humans.
The advent of land plants changed the planet forever.
When there's no snow, there's no need for their winter whites.
The first organism to be able to walk actually never did.
When the crocs reach their full size, they become trapped inside the caves for the rest of their lives.
This makes 11 total Archaeopteryx specimens.