When big isn't better: How the flu bug bit Google

Numbers and data can be critical tools in bringing complex issues into focus. The understanding of diseases, for example, benefits from algorithms that help monitor their spread. But without context, a number may be just a number, or even misleading. Google's data-aggregating tool Google Flu Trend was designed to provide real-time monitoring of flu cases around the world, but it also illustrates where 'big-data' analysis can go wrong.