Counting birds for more than 100 years generates data on a changing climate and there's an app for that: eBird. Surfer science using smart tech tracks ocean acidification and coastal temperatures in the Smartfin project, a recent startup. We spend "A Year in the Life of Citizen Science" including a Thanksgiving Monarch Butterfly Watch in California. Seasonal change is tracked by Latina and Native American teens in springtime in Albuquerque, New Mexico, and horseshoe crabs are surveyed in summer by retirees along mid-Atlantic coasts. In Uganda, World Bank economists and local partners generate data for sustainable development. The far-ranging potential of "Citizen Science in the Digital Age."