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do fish sleep

Fish do go to sleep, but in a rather different way to humans. ... read more

heat

Heat is a form of energy. It is created when molecules (small pieces) in an object move around. The study of heat and how it is used is called thermodynamics. Heat is very important to life on Earth. The Sun warms our planet and helps create weather. Heat from our bodies helps them work properly. ... read more

compounds, acids and bases, mixtures, and solutions

Every material is made of either a pure substance or a combination of substances. A substance is pure if it contains only one type of element. An element is a substance made up of all of the same type of atoms. Oxygen is a pure substance. It only contains oxygen atoms. Elements combine in several ways... read more

space exploration

Humans have always had a need to explore. In ancient times, people could study only the places where they lived. They could only wonder about the rest of the world and what might exist in the universe. Over the years, new technologies developed. With improved modes of transportation, we could explore ... read more

what is humidity

Discover the cause of uncomfortable, muggy weather that leaves you sweating. ... read more