On the other hand, difficult now doesn't mean difficult forever; an eighteen-wheeler would have been written off as requiring impossible amounts of energy to us

On the other hand, difficult now doesn't mean difficult forever; an eighteen-wheeler would have been written off as requiring impossible amounts of energy to use, if someone had described it in the 16th Century. ("_How_ many horsepower?!") "The same day as an article on the subject" is probably a little premature for any theories about its utility, too, although I'll certainly be interested if anyone who knows what he or she is talking about with physics thinks that this could be used to build an ansible or something...