Fan blade on Dart broke today

I have been driving it this way the entire time I have owned the car. You would think I would have felt a vibration at least. The rest of the fan is firmly bolted on. At 65 mph with my rear end I am just shy of 4000 rpm. I never heard a bang or clank or anything. It just started vibrating and I thought I had a flat. I was pissed because I finally bought a spare and a jack base for the car and they were both back in my garage! The radiator is fine, as you said, thank goodness. The hood appears fine as well, and I just painted top and bottom when I put the scoop on. Thank goodness, because the underneath part of the hood looks as perfect as the top.