Today is my 50 th college reunion. I won’t be able to attend, which is a shame, because Al Gore will be the Class Speaker, Mr. Tick Tock the Climate Clock himself. I'd love to have gone. I haven't seen Cambridge for years, and it would have been a revelation to reconnect face-to-face with some of my classmates. So as the next best thing, I'm going to take a fantasy flight across the Atlantic and share with you the personal statement I wrote just a year ago for our Class of ’69 50 th Anniversary Report. My theme was, “ What did I learn at Harvard ?” Here it is. The first thing I note as I sit down at my computer to write this personal statement for the 50 th Anniversary Report is that I had no computer 50 years ago. None of us did. So some things have changed dramatically. Many of these changed things are technological in nature and their development is (mostly) for the good. Some other things have...