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Curious Kids: why is the sea salty?

The salt in the sea has built up over billions of years – but it wouldn't have got there without freshwater rivers and streams.
When you have a wound, your body gets to work straight away to clean it out, kill germs and repair the skin. Shutterstock/Yakobchuk Viacheslav

Curious Kids: how do wounds heal?

The body tries to plug a wound quickly to stop germs getting in through broken skin and making you sick. But behind the scenes, your blood is working hard to repair a wound.

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