The molecules mark an explosion in the quantity of algae in the oceans ... ecological and evolutionary transitions in Earth's history," lead researcher Jochen Brocks told the BBC's Science ...

Where does it come from? You may already know that trees and other land plants help make the oxygen in our environment. But do not forget about algae, which produce over half of the oxygen that you ...

Have you ever seen brown or green goo floating on a river or in the ocean? Or have you noticed how the walls of a fish tank sometimes turn green and slimy? These are all examples of algae—but there is ...