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energy

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why does mixing alcoholic drinks make you ill

There are lots of theories on why mixing different alcoholic drinks might make you sick. There are different chemicals in different types of alcoholic drinks that infl uence the speed of absorption and the severity of a hangover. These include bubbles, sugar and compounds known as ‘congeners’, and... read more

the human body organs and systems

Your body is like a complex machine. Many parts make up your body and work to keep you going. Some parts, like your eyes and hands, are easy to see. Some parts, like your vocal cords, hide inside your body. When you hum, the vibrations you feel are your vocal cords at work. Some parts of the body are ... 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