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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

what is chemistry

Chemistry is the study of substances and the changes that happen to them. Substances are things like food, clothes, and medicine. Chemistry is very important. Plastic bags and shoes with rubber soles would not exist without chemistry. Fuels for cars, airplanes, and rockets would not exist without chem... read more

why are circles 360 degrees and not a round number

Circles have 360 degrees due to the Sumerians’ observations of the Sun’s motion across the sky. ... read more

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

types of animals

There are many different animals in the world. Animals may eat plants or meat to live. They live in different types of environments all around the world. Their bodies help them to survive in their habitat. ... read more