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where did the sand in the sahara desert come from

The sand in the Sahara is a result of rock erosion and weathering. ... read more

if a nucleus were the size of a marble how big would the atom be

If an atom’s nucleus were the size of a marble, the atom would be over 120 metres across. ... 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

nuclear energy

The protons and neutrons of an atom release nuclear energy when they break apart. Every atom contains a lot of energy. The forces that hold the atom together are the strongest forces that scientists know of. ... 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