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How it works

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

the environment in danger

Everything on Earth is connected in some way. Changes on land can affect the air. Changes in the air can affect the water. Damage to one thing always affects something else. It is easy to damage the Earth. Our planet’s population continues to grow. More people means we need to produce more food and ... read more

energy

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people who study animals

There are many things about animals that can be studied. We study their anatomy, their behavior, and how they live in the wild. We also learn more about our own bodies, behavior, and development when we look at other animals. We study how animal life can have an affect on humans and how humans can hav... read more

how do polarised sunglasses work

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