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 ...

Red and brown algae are found only in saltwater and are also called seaweed. Did you know that algae of all four types have been a food source for people for at least 14,000 years? For example, the ...

Contaminated water is the quickest way to spread diseases and trigger health problems. For example, algae blooms are one of ...