On your start page, under all posts (which seem to be chronological), it sits below "The room the economy can’t see", so I did not associate it with the follow up.
I wish people would gamble with something other than a proof-of-work coin. There are very similar alternatives now. When bitcoin rises, more money is spent on mining. Whoever holds bitcoin is in part responsible for this waste of energy.
Orange oil works wonders. It's explicitly not food safe, but you get that stuff on your hand every time you peel an orange and it's also present in juice. Just rinse them afterwards and wear gloves.
Sure if you are already airing every hour you don't need it. Then for me it was surprising how often I have to air and for how long (also depends on draft and temperature difference). Once you take into account the more harmful particulate matter coming in from outside, it's about finding a compromise, and without measuring you are tapping in the dark. But in the end people get old without all that stuff.