Heimlich maneuver on a nurse.

I gave away a bunch of trees I’d raised from seed. They were Metasequoias, long thought extinct and known only through fossils. I’d never seen any locally and thought it might be fun to get them going again. They were native here ~40 million years ago.

informed a random dude that his broken macbook he was selling for cheap is easily fixed with a software patch

There was this Chinese girl in the lobby of the hospital I was getting some testing done at. She was stuck there. I offered her an Uber, but she declined and asked to use my phone instead. She called her mom and left a voicemail. I left and her mom called me back. I told her her daughter left her a voicemail and that she was waiting at the hospital. Neither of them spoke English very well. They were both very kind. Not a big help, but it felt nice to do it.

I gave 15 USD to someone who looked really down on their luck and (seem to me) to be genuinely at their wits end

Probably giving some advice here on Lemmy. But I try to do some small things here and there. Help strangers who get lost at the jungle of German train stations and so on. Generally works out well. And I also get help or advice in return, (for example once I struggle with a ticket machine in a foreign country), so it goes both ways.