The great war clean-up
A century after the end of the first world war, the task of disposing of old chemical weapons continues. Michael Freemantle reports
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
The atmospheric nitrogen question
Pollutants, key atmospheric components and vital fertilisers: nitrogen compounds are all of these, as Emma Davies finds out
