Last fall I had the chance to speak about “Visualizing Water’s Pasts: The Space and Time of Water Uses in the Po River Valley” at the 2014 edition of the Sagan National Colloquium at Ohio Wesleyan University, entitled ” H2O-Water in Our World”. I am really grateful to the organizers for inviting me. If you are interested in what I had to say, here is the video of the talk.