The New York Times has recently drawn its attention to a publication by Daniel Monsivais-Velázquez and other IBSEN members at Aalto University. Their work illustrates how, although we may live in a fully technological world,  our biological time is still governed by the most ancient of clocks: the Sun. You can find the article in this link and the original publication “Tracking urban human activity from mobile phone calling patterns” in our section of selected publications.