Russian scientists have crafted an AI-based algorithm that uses the activity tracking from smartphones and smartwatches to estimate your lifespan with far greater precision than past models. Engadget reports: The team used a convolutional neural network to find the "biologically relevant" motion patterns in a large set of U.S. health survey data and correlate that to both lifespans and overall health. It would look for not just step counts, but how often you switch between active and inactive periods -- many of the other factors in your life, such as your sleeping habits and gym visits, are reflected in those switches. After that, it was just a matter of applying the understanding to a week's worth of data from test subjects' phones. You can even try it yourself through Gero Lifespan, an iPhone app that uses data from Apple Health, Fitbit and Rescuetime (a PC productivity measurement app) to predict your longevity.