Chicago road crews are scrambling to fill 67,000 potholes a month. Communities in Pennsylvania rely on 100-year-old water pipes made of wood. Squirrels still cause widespread blackouts. The country’s 600,000 bridges, four million miles of roads, and 30,000 wastewater plants desperately need attention. The solution isn’t patches, it’s an overhaul. Soon roads and power lines will fix themselves, and we’ll mine energy from sewage. America’s 21st-century tune-up won’t happen overnight, but we could start reaping the benefits (faster broadband! cleaner water!) within the next few years.