"Harvest and Sowing", a posthumous work by French mathematician Alexandre Grothendieck, is published by Gallimard eight years after his death. Described as a 'genius', 'radical ecologist' and 'hermit', Grothendieck is considered "the greatest mathematician of the 20th century". His children entrusted a Parisian bookseller with trunks containing mathematical and literary notes as well as a notebook tracing the convoys of deported Jews name by name. IMAGES AND SOUNDBITES