Interesting that the fire in the fireplace seemed to have no effect. This post gives a pessimistic estimate of 25,000 (pm2.5 I believe) in worst possible conditions and 2-3 orders of magnitude better (25-250?) under ideal conditions. Interesting that you found essentially no effect. Maybe good conditions/a flue with good draw reduces it to essentially zero?

It seems like your measurements for the candles match theirs as well "⁠a spike to around 50-200 with particles hang in the air for 3-5 hours⁠". Obviously, an airtight lid (as they suggest) is not possible for Hanukkah candles (or the matches themselves), but I would be curious to see how running them under water or using a snuffer changes things (or just taking them outside to blow them out). 

I'd also be curious to see how different types of lighters perform vs matches. I would guess that any type of lighter would be a lot better, but perhaps running the matches under water to extinguish them would be almost as good - though I would guess that a significant portion of their emissions comes from just lighting them.

I think I misspoke slightly here. I have the MK III and it appears to be the MK II that is available as a kit. Not sure what the differences are.

I’ve experimented quite a bit with piezos on percussion. The only thing I’ve found remotely decent was the Zeppelin Design Labs Cortado MK II. I’ve used it with a LP Laptop Conga (attached with blue tack). If you slide your hands at all you get a lot of whooshy white noise, and you can get noise from jostling the cable, but otherwise it sounds pretty much like a normal microphone minus any room ambiance. Apparently they also use them under basketball courts for TV broadcasts.

It’s a bit on the expensive side but they have a much cheaper DIY kit version if you are at all handy with electronics. It does require phantom power.

I see that there has already been some discussion of Scott's post here where xarkn argues that it enforces division and tribal warfare.

I came here to say separate blankets too. Employed this approach not 2 weeks ago with 5 and 8 y-o. Eventually 8 y-o decided he wanted to sleep on the floor, which worked out great as well with a folded up bed spread under him. With their lighter bodies, kids need a lot less padding under them than us adults - thought you might have to sell them on the idea a bit. We’ve built cozy nests in an open closet before as well, too good effect.

I also get an error for boston-effective-altruists. "Content unavailable Click here to try again." Perhaps a box needs to be checked to make it publicly available?

Yes. I heard back from them this morning and they recommended contacting the orgs who are doing the trials directly. I googled and called a couple and they both said they are closed to adults now. Only enrolling children and adolescents. I imagine it's a lot easier to sign up adults for this type of thing...

Huh, I called this morning and the guy I spoke to said it isn't Pfizer doing the trial. They said I had to call the other (Austrian?) number on the page, or email info@valneva.com. I did the latter. 

Wow thanks! I was all over Google and the Valneva site but didn’t think to look at Pfizer.