"Well, in our country," said Alice, still panting a little, "you'd generally get to somewhere else - if you ran very fast for a long time, as we've been doing." "A slow sort of country!" said the Red Queen. "Now here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run at least twice as fast as that!" Wikipedia: Red-Queen-Hypothese