About 99 percent of our infrastructure is dependent on computers. What would happen if one day the data or electricity grid collapses? How should we get money, what happens to things like health-care and water purification? Anna Charlotta Gunnarsson talks to Dan Larsson, national incident management coordinator and information security expert at FRA (Defense Radio Agency), about how vulnerable our computerized society is, how our preparedness looks and what happens if an emergency situation arises. In addition, we accompany the children at Dalstugan's preschool to a treatment plant to see what happens to what we flush down the toilet. We also get to see pictures from Kibera, a slum area in Nairobi. There, Camilla Wirseen and Anders Wilhelmson collaborates with local biochemists.