Whenever I get back from a trip – as happened recently upon my return from the Urban Future Conference #uf23 in Stuttgart – someone invariably says: “Oh, you went there? That’s on my bucket list.”

When I gave a TED Talk in Rio de Janeiro a few years ago, same thing. When I spoke at the Nobel Peace Prize in 2012 in Oslo, ditto. “On my bucket list.”

Once in a while, someone will ask me: “What’s left on your bucket list?”

Nothing. I never had one.