The Self Wiping Arse
Dogs have always been able to do that...it does ruin the carpet though.
When I was younger I was particularly disappointed that I was not born in an era that had Star Fleet. The generation that are alive when that's invented will be able to go to Star Fleet Academy and become a crewman on the Enterprise, perhaps even have it away with T'Pol.
Although I do think that there have been some relatively impressive improvements in computer technologies in the past 40+ years...video games, computer processing power, tablets, mobile phones etc.