I gave blood again, for the 34th time. Each donation is a US pint (it’s one of the rare occasions when the UK is on the receiving end of cultural imperialism), so that makes about 16L over my lifetime, approximately three adult humans’ worth. It’s also enough to run a shower for two minutes, or fill one fifth of a bath. I don’t know which would be more horrifying. Probably the shower. It was my first donation under the new, significantly less homophobic blood donor rules, which is a good change to see in operation.