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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

what is humidity

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

waves, sound, and light

Light and sound are two of the most important forms of energy to humans. People see light and hear sound. Light from the Sun makes life on Earth possible. Sound is one of the most important ways that animals and humans communicate. Both sound and light travel as waves. Light also behaves like a partic... read more

what is astronomy

Have you ever looked up in the sky and wondered what life would be like if you lived on Mars? Astronomy is the study of the universe, or outer space, and can help you find the answer to your question. ... read more

how are the seeds removed from seedless grapes

Seedless grapes are in fact cloned from genetically defected grapevines. ... read more