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how do polarised sunglasses work

Polarised sunglasses have filters that block some light waves while letting others through. ... read more

how to make a soap powered boat

Propel a paper boat using nothing more than washing-up liquid! ... read more

electricity and magnetism

Electricity and magnetism are everywhere. Electricity is a form of energy. Magnetism is also a form of energy. They make it possible for televisions, computers, and many other electronic devices to exist. Medicine uses them to help treat illnesses in humans and animals. ... read more

how we use plants

Humans use plants in many ways. We build structures with them. We plant them in and around our homes to enjoy their colors, forms, and fragrance. We study them to learn from them. We eat them and use them to make food products and drinks. We even make our clothes from their fibers. Some of them provi... 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