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why does it hurt so much when you step on a plug

Balancing your body weight on the pins of a plug puts huge pressure on your foot. ... read more

atoms and elements

Atoms are the building blocks of all matter. Atoms are very small. Many atoms put together make up everything in the world. Atoms are so small that you cannot see an individual atom without a special microscope. All atoms are made of the same basic parts. Putting these parts together in different ways... read more

people who study chemistry

Hundreds of years ago, people called alchemists used chemical reactions. They used them to make medicines and combine metals. Some of them thought they could create gold from other metals. Some of them thought they could make people live forever. Unfortunately, they were wrong. Today, we know a lot mo... read more

why do oily things stain clothes

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