We all have smells we're fond of that bring back memories - but what about things we aren't able to smell anyone?

The first international research project exploring past and present scents has just started in Europe.

Using expertise from history, art, computational linguistics and chemistry, a group of researchers known as the Odeuropa consortium will record odours as familiar tobacco and as unusual as dung chips and 18th century smelling salts to create an encyclopedia of historic smells so we don't forget what our world smelled like.

Dr Michelle Dickinson joined Francesca Rudkin to explain.

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