Your smartphone stores all types of information digitally, which is amplified as new technology is added, such as accelerometers and GPS receivers. Every time you use a mobile phone, it stores digital information. Not just the numbers you call and how long you talk, but where you are when your phone is on. Many cell phones are preloaded with health-related apps that can track how many steps you take, how many calories you burn, and your heart rate. Today, many decisions are outsourced to “big data”. Instead of starting with a theory and testing it, we just gather enough data and see what patterns come out.