Sketch Wallpapers News

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How it works

the parts of plants

Plant Cells ... read more

panning for gold

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

how we use animals

Humans use animals for a wide variety of purposes. Animals such as dogs, cats, and hamsters can be family pets. Horse racing and dog shows can provide entertainment for people. Scientists study animals. Some animals are eaten as food. Humans use many different products made from animals. Farmers raise... read more

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

inside a serpent

No legs? No problem! Check out the science beneath the snakeskin. ... read more