"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." A type of zooplankton, Daphnia pulex (a.k.a. the water flea) is a microscopic crustacean whose unique ...

Nikon's Small World competition recognizes the art and science of microscope photography. This year's winning images reveal firing neurons, the vessels of leaves and eyeballs, and colorful crystals ...

Phytoplankton is an important component of the food-web and is predated by a wide variety of aquatic organisms, such as water fleas, copepods and fish. These microscopic algae also play a crucial role ...