Old-fashioned ways of preserving food made for salty, vinegary or chewy meals - but it was often a choice between that or starving. Soldiers, explorers and ordinary people alike faced malnutrition and food poisoning - but then came a French revolution... in a can! 

First invented in Napoleonic France, the humble can would feed armies; sustain bold exploration; and give poor people access to wholesome food all year round. We don't think about the tin can much today, but its history is filled with skullduggery, vast riches and deadly choking hazards.