Seeing as the PC [i]is[/i] the best invention ever along with similar inventions like the Mac or Linuk or whatever you feel then it's already be done; the best invention and the best inventions ever have [i]already[/i] been done... They cannot be topped... Everything that has already been invented can only be improved upon with each new model. The actual inventions have all been done already or are still on the drawing board to have already been come up with, and, indeed hypothesised (like nuclear fission coolant being replaced with molten sodium metal or nuclear fusion tokamaks which actually produce energy beyond break-even and is harvested by a lithium ion blanket and stored like a battery for electricity for the national grid...). So there's nothing to be invented that it good anymore that we're not already coming up with or is too complex to think about. Therefore we cannot create the best invention ever because the best inventions ever have already been done or are stuck on the drawing board but still in theory. So therefore it is impossible to come up with "the best invention ever".