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how does chlorine clean swimming pools

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

endangered species

Life on Earth exists in a balance between the environment and the plants and animals that live on it. Throughout history, animals have become extinct when the environment changed. Scientists have discovered and documented many animals that have become extinct by studying fossils. Today, many species o... read more

why do oily things stain clothes

Removing stains straight away helps to prevent them reacting with the air. ... read more

why do computers use binary code

The ones and zeros of binary code are the native language of computer chips. ... read more

teeth and venom

A fearsome part of every snake is its teeth. Here’s the lowdown on those serpentine pearly whites… ... read more