Politicians or pundits can distort or cherry-pick climate science any way they want to try and gain temporary influence with the public. But any serious industrialist who's facing 'climate exposure' - as it's now called by money managers - cannot afford to engage in that sort of self-delusion.

Transactive memory works best when you have a sense of how your partners' minds work - where they're strong, where they're weak, where their biases lie. I can judge that for people close to me. But it's harder with digital tools, particularly search engines.

A huge amount of our everyday thinking - powerful, creative, and resonant stuff - is done socially: talking to other people, arguing with them, relying on them to recall information for us.

The main message of 'Smarter Than You Think' is an attempt to look at the productively new and interesting ways that we have begun to learn about the world, to think about what we found, and to mull it over and argue about it with other people as we use technology.

We're dumber and less cognitively nimble if we're not around other people - and, now, other machines.