It doesn't matter whether you can or cannot achieve high temperature superconductivity or fuel cells, they will always be on the list because if you could achieve them they would be extremely valuable.
“I always planned to retire when I was at the top and at Manchester United I have reached the pinnacle of my career.”
“More than 65,000 horses were slaughtered in the United States in 2004, a 50 percent increase since 2002.”