Linear regression is a widely used ML algorithm. So far I have only encountered 'boring' applications of it. (e.g predict sales for next quarter, predict housing prices for next year , predict population of a country by 2020 etc.)
What are some interesting/cool application of linear regression? Finding cool applications greatly helps in motivating myself to learn, hence the quest.
Cool as in: Application to stock trading, application to video games, application to astronomy, application to sports betting, application to airfare prediction