What is it about the number 10,000? That’s the number of hours of practice supposedly required to master something difficult. It’s also said to be the number of steps you should be taking daily to ward off death and disease. Our Well Informed column doesn’t tell you how much practice you need to play the oboe well, but it does scrutinise step-count conventional wisdom. 

Investors have been selling tech stocks for the past few days. So now is a good time to read our Schumpeter column on the dodgy numbers that have helped sustain the AI boom. The reported revenues of Anthropic and OpenAI, for example, are merely “vague riffs on a famously vague Silicon Valley metric: ARR”.

And on tonight’s Insider we interview Alice Weidel, the leader of Germany’s right-wing populist Alternative for Germany, currently leading the polls in Europe’s most important country. You can watch the episode now.