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matter

Matter is anything that takes up space and has mass. Atoms or parts of atoms form all matter. It is everything from the tiniest electron to the planets and stars. ... read more

how do polarised sunglasses work

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

what is humidity

Discover the cause of uncomfortable, muggy weather that leaves you sweating. ... read more

atoms and elements

Atoms are the building blocks of all matter. Atoms are very small. Many atoms put together make up everything in the world. Atoms are so small that you cannot see an individual atom without a special microscope. All atoms are made of the same basic parts. Putting these parts together in different 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