WHAT were the greatest human catastrophes of the 20th century? When asked this question, most people answer the Second World War, followed by the First World War. The former killed around 50 million people, the latter 17 million. But there was another catastrophe that dwarfed both of these, that is rarely mentioned. The influenza pandemic of 1918-1920, better known as the Spanish flu, killed at least 50 million people worldwide, and perhaps as many as 100 million…

This article first appeared in the BPS Research Digest on 22 January 2016. To continue reading, click here.