jefftk

Joined 17 years ago

Karma

24,132

Submissions

6,113

Member since

Jul 2

https://www.jefftk.com [email protected]

I lead SecureBio Detection: https://www.jefftk.com/p/leaving-google-joining-the-nucleic-acid-observatory

View on Hacker News

Recent submissions

Comment · 2 days ago

Whether we call it "permanent summer time" or "aligning with the political region to the east" it's the same thing: late sunrise, late sunset.

(Spain is effectively using single-double DST, based on the delta from solar)

Comment · 2 days ago

Many places are permanently ahead by at least an hour, including Spain, western China (+2), and Argentina.

https://en.wikipedia.org/wiki/Time_zone#/media/File:Solar_ti...

Comment · 5 days ago

This seems like it's also an argument against heating rooms in winter?

Comment · 8 days ago

An AirFanta 3Pro on low (2) is 5W, which is $10 on average (but more like $15 in high $/kWh places like MA and CA).

Comment · 8 days ago

IQAir HyperHEPA is substantially worse than the AirFanta 3Pro. The 3Pro gives you about 10x more clean air per dollar (2 CFM/$ vs 0.2 CFM/$), and 2.5x more clean air at a given noise level (45dBA: 213 vs 86 CFM).

I agree big fans moving slowly is better all else equal, and something AirFanta-like that used a 12" fan could be even better.

Comment · 8 days ago

My aunt is immunocompromised and carries one around with her in crowded situations, keeping it pointed right at her face 8-12in away. It works well for her, especially since she's had a lung transplant and doesn't do well with a mask.

Comment · 8 days ago

It just looks grey, but the housing is also grey, so I don't think it generally reads to people as dirty.

Comment · 8 days ago

I have three in my living room, and while they're not fashion they blend in fine: https://photos.app.goo.gl/wvRc4hEYqQep4zgd9

I leave them on setting 2 (unless someone is sick or we're having a lot of people over), and we get ~425 CFM for about $40/y in power (~5W each).

Comment · 8 days ago

> ~50-100W of power

That sounds too high? An AirFanta 3Pro on "2" is 141 CFM at under 5W https://www.jefftk.com/p/running-an-air-purifier-on-batterie...

Comment · 8 days ago

There's either a typo or something wrong with your sensor: you can't have pm10 < pm2.5.

(Equivalent to saying you have more people under 2.5 years old than under 10 years old.)

Comment · 9 days ago

There's only a ~1 in 17 chance that they'd all be below 256 if 384 was the limit. My money is on accidentally generating a 1-byte random number.

Comment · 12 days ago

> for now the autonomous flight control software is incapable of complex, dynamic missions

I give it 1-2y.

Comment · 12 days ago

The 2010 change was only for gmail. Search was 2011 [1] and other changes were post-2013. I was there at the time, and there was a huge internal reprioritization in response to the Snowden news, especially for internal traffic.

[1] https://googleblog.blogspot.com/2011/10/making-search-more-s...

Comment · 13 days ago

If you have not watched the ramp video, I really recommend it. It's very impressive, even if it doesn't make any sense in a consumer vehicle.

Comment · 13 days ago

If you mean one that can do the stunts from the demo I'm in, but not for $10k: that's more than I'm willing to bet with people I don't know. How about $100, since most of the point of a bet is formalizing a disagreement and showing that you're serious?