Want to reduce jet lag? A new app called Entrain claims it is the first to use a numbers-based approach to "entrainment," the scientific term for synchronizing circadian rhythms with the outside hour. It's based on work by Danny Forger, a professor of mathematics at the University of Michigan, and Kirill Serkh, a doctoral student at Yale University.
Entrain is built around the premise that light, particularly from the sun and in wavelengths that appear to our eyes as the color blue, is the strongest signal to regulate circadian rhythms. These fluctuations in behaviors and bodily functions, tied to the planet's 24-hour day, do more than guide us to eat and sleep. They govern processes in each one of our cells.