I wonder if 'leisure-person years' is a better metric of progress (where 'leisure' is defined as the number of hours you can spend neither raising/searching for food nor sleeping).
Be really hard to identify, though.
Be really hard to identify, though.
Yeah and it took "us" 60 years from discovering flight to landing a rocket on the moon. Took "us" 60 years from the first computer to globally-live video streaming in your pocket. Time is a pointless metric when it comes to technology. You don't know what someone is cooking up down in some basement somewhere that will be released tomorrow and shatter your concept of reality.