If
I had to pick the critical technology for the 20th
century, the bit of social lubricant without which the wheels
would've come off the whole enterprise, I'd say it was the sitcom.
Starting with the Second World War a whole series of things
happened--rising GDP per capita, rising educational attainment,
rising life expectancy and, critically, a rising number of people who
were working five-day work weeks. For the first time, society
forced onto an enormous number of its citizens the requirement to manage
something they had never had to manage before--free time.