Update: here are some readers' letters about our exchange.
I've never arm-wrestled Bill Gates, but we have now had a good
natured debate in the pages of the Wall Street Journal.
Here's his effort, and here's mine.
A quote from his:
Although I strongly disagree with what Mr.
Ridley says in these pages about some of the critical issues facing
the world today, his wider narrative is based on two ideas that are
very important and powerful.
A quote from mine:
I am certainly not saying, "Don't worry, be
happy." Rather, I'm saying, "Don't despair, be ambitious"-though I
admit it's not nearly as snappy a song lyric.