Nutrition (also called nourishment or aliment) is providing cells and organisms with the materials necessary (in the form of food) to support life. Many common health problems can be prevented or alleviated with a healthy diet. Watch to learn more.
Find out how scientists think ''Homo sapiens'' developed their big brain and what it costs to maintain it.
Think plant-like protists are too small to be much use? Well, they aren't all small, and some are quite useful.