It's somewhat arbitrary, but the threshold where you're not allowed to resubmit a story on HN is if it reaches over 20 points. I'm not sure if that's still the case, but it was a few years ago when I asked why I couldn't resubmit.
Also, just from my subjective sense, it's a reasonable cutoff for when articles are officially on the front page for any meaningful amount of time rather than they briefly appear and then fall off.
Ah! You are right. Google supports a level of indirection that Kagi does not. "100 pesos to dollars" or "100 pesos to usd". If you use the actual currency code, Kagi works.
What's the difference between Simula One, Simula One Tethered Edition and Founder Edition?
Simula One: headset + compute pack, works standalone
Simula One Tethered Edition: just the headset, needs a host PC
Simula One Founders Edition: headset + compute pack, works standalone, has extra bling (and potentially slightly better specs as they can make more lead time vs cost tradeoffs)
As for doing fit testing at home, using cigarette smoke might be helpful:
"... it was found that tobacco smoke as it comes from a cigarette is an extremely concentrated aerosol with a relatively stable distribution of sizes ranging from 0.1 to 1.0 micron, peaked between 0.2 and 0.25 micron."