Positive social emotions like compassion and empathy are generally good for us, and we want to encourage them. But do we know how to most reliably raise children to care about the suffering of other people? I'm not sure we do.

I love London in the rare parts of the year when it's quiet, and no time is more reliably quiet than the week between Christmas and New Year.

When I was a kid, I was reliably informed that we'd have gone to Mars by 1985, and of course it's 2012, and we're still really no closer to a human expedition to Mars, but that shouldn't detract from the amazing achievements that are being done on a day-to-day basis by robotic envoys.