This reminds me of the story of how Target were able to quite precisely figure out whether their female customers were pregnant, and even when the due dates wer

This reminds me of the story of how Target were able to quite precisely figure out whether their female customers were pregnant, and even when the due dates were: http://www.nytimes.com/2012/02/19/magazine/shopping-habits.html?pagewanted=all http://www.nytimes.com/2012/02/19/magazine/shopping-habits.h...