"What's 'online'?" asked the elderly gentleman of his son. I was eavesdropping, and at first, I couldn't believe that anyone still alive didn't know what "online" was. Isn't that pretty much equivalent to oxygen or gravity now? But then, because in the big countdown of life, I'm also on the downhill slope, closer to the end than to the beginning, I started thinking about how wrenching technological change has become.