@Liberalism2021 @alexmeshkin KN95s are much, much worse in terms of fit and a lot of them are fake too.

@Liberalism2021 @alexmeshkin KN95 在合身性方面要差得多，而且很多都是假的。

@tylerblack32 @GidMK What is the bump in 2017-2018? Is that plausibly random or might there be some cause?

@tylerblack32 @GidMK 2017-2018 年的颠簸是什么？这似乎是随机的还是可能有某种原因？

@tylerblack32 @mommyca20 @washingtonpost The headline didn't.

@tylerblack32 @mommyca20 @washingtonpost 标题没有。

@Liberalism2021 @alexmeshkin Here is the same mask from 2008, cleared by FDA for use by the general public during that pandemic. No fit test needed
https://twitter.com/AeonCoin/s...

@Liberalism2021 @alexmeshkin 这是 2008 年的同一个口罩，经 FDA 批准，在大流行期间供公众使用。无需适合测试
https://twitter.com/AeonCoin/s...

@Liberalism2021 @alexmeshkin You don't need fit tested. Non-fit tested w/good fit is still very effective and if you gave all adults 3M Aura and guidance how to use it properly, >95% would pass a fit test.

@Liberalism2021 @alexmeshkin 你不需要适合测试。不合身测试 w/良好合身仍然非常有效，如果您给所有成年人 3M Aura 并指导如何正确使用它，

@greg_travis @TRyanGregory It presents with a wide range of severity from asymptomatic to death. You probably don't remember the milder cases, may not have even known about them.
Moderate or worse flu is likely much less than 1/5 years.

@greg_travis @TRyanGregory 它呈现出从无症状到死亡的各种严重程度。您可能不记得较轻的病例，甚至可能不知道它们。
中度或更严重的流感可能远少于 1/5 年。

@greg_travis @famulare_mike This is a function of transmission as well as severity, but of course they're both important.

@greg_travis @famulare_mike 这是传播和严重性的功能，但当然它们都很重要。

@MelpomeneMel @derekberes @LoboGerda @drsiyabmd VP? He gets his money from Arnold Ventures. This is widely known, right?

@MelpomeneMel @derekberes @LoboGerda @drsiyabmd 副总裁？他从 Arnold Ventures 获得资金。这是众所周知的，对吧？

@TWenseleers He doesn't.

@TWenseleers 他没有。

@GainOfDystopia @SteverRobbins @LazarusLong13 One thing to keep in mind is they're not always more expensive. Pricing on these is very much "retail" (i.e. frequent discounts and bundle deals). Sometime the higher MPR are cheaper. I suggest people buy whatever is on sale. Actually I suggest most just do the Lennox version.

@GainOfDystopia @SteverRobbins @LazarusLong13 要记住的一件事是它们并不总是更贵。这些定价非常“零售”（即频繁的折扣和捆绑交易）。有时更高的 MPR 更便宜。我建议人们购买任何打折的东西。实际上，我建议大多数人只做 Lennox 版本。

@GainOfDystopia @LazarusLong13 @SteverRobbins It wouldn't be less if there were good mixing, and that's an advantage of the very high airflow despite lower filtration % of CR, as long as the space isn't too large. 13% remaining would be 87%, which is more removed than 81% one pass of the MPR 2800. All the other sizes also >.

@GainOfDystopia @LazarusLong13 @SteverRobbins 如果有良好的混合，那就不会更少，这是非常高的气流的优势，尽管 CR 的过滤百分比较低，只要空间不太大。剩余的 13% 将是 87%，这比 MPR 2800 一次通过的 81% 去除得更多。所有其他尺寸也

@GainOfDystopia @LazarusLong13 @SteverRobbins Every consumer grade air "HEPA" cleaner I've ever seen (quite a few) has pretty mediocre friction fit with loose foam or even no foam. I'd be shocked if any of them don't significantly leak.

@GainOfDystopia @LazarusLong13 @SteverRobbins 我见过的每一种消费级空气“HEPA”清洁剂（不少）都具有相当平庸的摩擦贴合性，松散的泡沫甚至没有泡沫。如果其中任何一个没有明显泄漏，我会感到震惊。

@GainOfDystopia @LazarusLong13 @SteverRobbins I suspect there is leakage in those devices. The filter itself probably meets standards but air going through the box may not. But does it matter if you're filtering a room? It's not a PAPR.

@GainOfDystopia @LazarusLong13 @SteverRobbins 我怀疑这些设备有泄漏。过滤器本身可能符合标准，但通过盒子的空气可能不符合标准。但是，如果您要过滤房间，这有关系吗？这不是 PAPR。

@GainOfDystopia @LazarusLong13 @SteverRobbins I'm not sure what that 93% means but you were talking about 0.3 particles which are shown on the chart I just linked at 81%, which is somewhere in between 1 and 2 passes. Considering reduced flow rate it's barely different.

@GainOfDystopia @LazarusLong13 @SteverRobbins 我不确定 93% 是什么意思，但你说的是 0.3 个粒子，我刚刚以 81% 链接的图表上显示了这些粒子，介于 1 到 2 次之间。考虑到降低的流速，它几乎没有什么不同。

@GainOfDystopia @LazarusLong13 @SteverRobbins I don't know if it is the same paper. There is one that shows measurements for MERV filters. They're all low enough that you're relying on multiple passes.

@GainOfDystopia @LazarusLong13 @SteverRobbins 我不知道是不是同一张纸。有一个显示 MERV 过滤器的测量值。它们都足够低，以至于您依赖于多次通过。

@GainOfDystopia @LazarusLong13 @SteverRobbins In another chart in his paper he shows actual percentage removed at each particle size.

@GainOfDystopia @LazarusLong13 @SteverRobbins 在他论文的另一张图表中，他显示了每种粒径的实际去除百分比。

@GainOfDystopia @LazarusLong13 @SteverRobbins They're a little better (81% vs 62%) but still not close to HEPA and still relying on a high flow rate resulting in multiple passes to be very effective. Also trading off lower flow rate due to slightly higher pressure drop. It ends up being very similar.
https://www.filtrete.com/3M/en...

@GainOfDystopia @LazarusLong13 @SteverRobbins 他们稍微好一点（81% 对 62%），但仍然不接近 HEPA，并且仍然依赖于高流速，导致多次通过非常有效。由于压降稍高，还需要权衡较低的流速。它最终非常相似。
https://www.filtrete.com/3M/恩...

@JoeAtikian @SizeMichael @GuyDealership @Noahpinion You're still missing the point. Changing the tax structure is not necessarily "taxes go up". It can be revenue neutral.

@JoeAtikian @SizeMichael @GuyDealership @Noahpinion 你还是没抓住重点。改变税收结构并不一定是“税收上调”。它可以是收入中性的。

@ewanbirney @pathogenomenick Mineral oil is less dense than water.

@ewanbirney @pathogenomenick 矿物油的密度低于水。

@Jesse_Livermore @darioperkins How do you know anything from a single example? It won't necessarily repeat.

@Jesse_Livermore @darioperkins 你怎么知道一个例子？它不一定会重复。