When, on 12 June, Elon Musk made Likes on X private (so that only a post author can see who likes their post) this seemed like a small change. But small changes in complex systems like X can have big, unpredictable effects. 1/7

Between Sept 21 & Sept 23, "households in the bottom quarter experienced inflation rates 5.6 %age points higher than the top quarter." So not only are households in the bottom quartile less able to absorb higher levels of inflation; they've also experienced much higher rates.

Please stop riding through red lights when pedestrians have the green man to cross the road. These crossings have rotating cones underneath the push button box to alert blind people when it’s safe to cross & it’s not safe when people ride through them on a red light at any speed.

BBC entertainment tonight: Taylor Swift tour is adding £1bn to UK economy. BBC More Or Less, 29 May: rubbish. Economic activity shifts to areas with concerts; spend on merch goes to Taylor Swift Inc in the US.

Often, proposed new NHS service models look good on paper but their evaluation shows no impact (or worse). So it's nice to find something which seems to work well and in line with theory. New surgical hubs increase activity by 22%.