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How it works

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

galaxies

A galaxy is a system of dust, gas, and stars that collects over a very large area. Gravity binds the objects in a galaxy together. Within each galaxy are billions of stars. ... read more

how the body work

All the organs and systems of your body work together. When they work correctly you move, you fight off germs and diseases, you heal, you learn, you grow, and you age. In other words, you live. ... read more

molecules

Naturally occurring elements are usually a combination of several elements. Some combine with elements just like themselves. Others combine with different elements. Scientists call these combinations of elements molecules. They are made of at least two atoms and are stable. This means they have the sa... read more

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