This World Day of Social Justice, it's worth remembering that while the struggle for equity is ancient, our capacity to advance it has accelerated dramatically, powered by technologies that have expanded what philosopher Peter Singer calls "the expanding circle" of moral consideration.

I’m talking about the strange power of well-designed games. They don’t just tell you something’s important. They make you feel it. Every time I try a Geo AR game, I find myself pulled into a story before I even realise I’m learning anything. One minute I’m getting chased by a dinosaur or looking for the next clue, and the next, I’m caring about something I’d barely thought about before.