Youtube comments of mindstalk (@mindstalk).

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  32. To expand on the HEPA vs. CADR (clean air delivery rate) thing: If you were sucking air out of a room and passing it through a pipe to another room, with just one filter, then you would want as good a filter a possible, a la HEPA, with it's 99.97% or whatever filtration. You might want this for your HVAC system, especially if it's bringing outside smoke-ridden air -- if your HVAC is strong enough to push air through a HEPA filter, which it might not be. But a purifier off Amazon sits in a room, sucking in air, filtering it, spitting it out, and sucking in more air... some of which was already filtered, because air mixes. Here, filtering some air very well matters less than filtering all the air ASAP. Thus the idea of a MERV 13 or 14 filter taped to a fan, or the bigger Corsi-Rosenthal boxes with more filters (thus more area, lower pressure.) MERV 13 is filtering maybe just 50% of the worst size in a single pass, but by cycling a lot more air in a given time, the setup can supposedly clean a room faster than a similar sized HEPA purifier. And for much less money, as box fans and filters are generic items. While as the video clumsily indicates, some purifiers have become overpriced brand items. My own advice: if you don't do a filter/fan thing, look at CADR/$. The Levoit Vital 100S has 143 CFM (cubic feet per minute) for US$120 right now, $140 list price, with electronics for scheduling and such. The Core 300 is $100 for 140 CFM. So those options are 1-1.4 CFM/$. If you look at other models or brands, you shouldn't accept less than that, especially if it means paying for outright harmful features like ionizers. You probably won't get much better, though I think I calculated 1.6 for some model. Paying more for quiet might be worth it, but good luck. Sellers tend to advertise their high-setting CADR and their low-setting noise rating, which is not very helpful.
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  477. I lived in Osaka for 3 months, and took away all the same lessons and impressions (many of which I've been sharing in youtube comments for the past 5 years.) Osaka does even better, 25% of trips by bike. And note that this is with much worse weather than the Netherlands, also larger cities (so home-to-job distance will be bigger) and public transit that isn't bike friendly. Your Tokyo 'wide sidewalks' actually looked pretty narrow to me; I think the standard for arterials is supposed to be around 4 meters, or 13 feet or so. And in Osaka, most bikes along arterials were on the sidewalk/multi-use path (though many stayed on the local streets, too, of course.) Cynically, one reason more people don't look to Japan is that it's distant and more foreign; some would even invoke racism. But to be fair, I'm not sure how much we can learn from Japan's streets, except for new development. There's no quick path for turning a Chicago local street of 66 feet (right of way) into Tokyo street of 16 feet. For existing cities, streets are laid in already. We can re-arrange the asphalt easily, but I'm told moving curbs is expensive, and when buildings are already 80 feet apart wall to wall, there's not much we can do... unless we start building small buildings in the middle, creating two narrow streets out of one wide one. Density: NYC has a lower density of 10,000/km2 due to State Island and outer Queens. 15,000 is right there with Brooklyn and the Bronx or inner Queens. Paris France is 21,000. Also, I feel you should credit NJB a bit for title and "cities aren't loud" meme drop. :)
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  508. 1. As far as I know, not in general. (The video does mention a 5000 yen rebate for seniors to give up their driving license.) It's just sensible to bike when you have short trips and biking is cheap and safe. If you could bike at 3x your walking speed with minimal risk, why wouldn't you bike? There are dis_incentives to _driving_. Expensive gas, maybe harder to get a license, and above all, parking. No curbside parking and minimal parking mandates, so if you're driving in a city like Osaka or Tokyo you _will be paying to park everywhere. If you rent an apartment then you have to show the police that you've leased a garage parking space before you're allowed to buy and register a car, and that parking could be 30,000 yen a month. Also, where I lived in Osaka, most of the supermarkets around me didn't even have car parking. One was off-street, only accessible by foot or bike (with a huge bicycle hangar). One was on the street but on Street View I don't see any car parking, while there are bikes surrounding its two open walls. The other two were in the basements of train stations (and their associated malls); there were (paid) parking garages but you'd still have to get your groceries upstairs and into an adjacent building. And all four of those were within a 8-12 minute walk of my house -- my tiny house on a tiny lot, which did not have any car parking of its own, on a tiny street which you could drive down _very carefully_. So, you could walk or bike; drive to and pay for a garage and then walk down to the basement, in probably more time than just biking or even walking over; or drive further to some hypothetical supermarket further out that might actually have convenient car parking. Or in my case, walk from home to pick up my car from a garage or parking lot, to then drive...
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