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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

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

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more

how are the seeds removed from seedless grapes

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

mating and reproduction in animals

Mating ... read more