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Pile of rusty First World War One artillery grenade shells

The great war clean-up

By Michael Freemantle

A century after the end of the first world war, the task of disposing of old chemical weapons continues. Michael Freemantle reports

Lise Meitner and Otto Hahn in their Dahlem laboratory, Germany, in 1913

Hahn, Meitner and the discovery of nuclear fission


80 years ago, Otto Hahn and Lise Meitner made a discovery that led to nuclear weapons – yet Meitner was never given the recognition she deserved

Chemical plant at night

The atmospheric nitrogen question


Pollutants, key atmospheric components and vital fertilisers: nitrogen compounds are all of these, as Emma Davies finds out

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