>Nuclear airplanes
I zealously shill the values of nuclear power 7 days a week, but unless we discover a physics revelation nuclear airplanes are a horrible concept.
There are no forms of nuclear power production existing or theoretical which don't involve health-hazardous amounts of radioactive material. Even hydrogen fusion reactors activate the housing walls with neutrons. Miracle on the Hudson would have been much less miraculous if it meant terabecquerels of activity floating downstream.