I've often wondered.. If we were to have a cataclysmic war that wiped out most of the population and much of what we've built,  what would future archeologists be able to determine in 10-20 thousand years about our levels of technology? 

Thank goodness -- before watching it, I feared the subject of the video might have been "Reading." 

John, when I become King, I'm banning all audible-books, except for use by handicapped people. We'll make an exception for the deaf.