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how to make the ultimate sword

Discover the ancient art of forging a deadly weapon ... read more

why don’t grains of salt stick together

Common table salt doesn’t clump thanks to the addition of anti-caking agents. ... read more

panning for gold

How the 49ers found fortune in the famous Californian gold rush. ... 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

people who study space

Astronomers are people who study the sky. They make a career out of studying the sky. Amateur astronomers look at planets, stars, and galaxies as a hobby. Astrophysics deals with the behavior and physical properties of all the objects in space. Cosmology studies the origin and structure of the univers... read more