"the words "Crack" and "pot" occur to me.
if magnetic levitation was that simple, we'd have been there already."
The word 'ignoramus' comes to me. We already are there, McFly
http://www.o-keating.com/hsr/maglev.htm
Being able to do it and being able to do it efficiently enough to compete with oil are two different things. We are not already there. When it can be done profitibly, i.e., when it is cheaper to do than oil, it will be done.