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calchris42

202 karma · joined August 15, 2016

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calchris42··on Tesla Model Y Passes NHTSA's New 'Advanced Driver Assistance System' Tests
The article is vague, but I suspect this is referring to FMVSS-127 which makes certain active safety features mandatory in 2029 and also increases the difficulty of some required to pass scenarios. The new scenarios require responding from higher initial speeds which effectively requires longer sensor ranges and/or lower latency.
calchris42··on Waymo robotaxi hits a child near an elementary school in Santa Monica
AV’s with enough sensing are generally quite good at stopping quickly. It is usually the behavior prior to the critical encounter that has room for improvement.

The question will be whether 17 mph was a reasonably cautious speed for this specific scenario. Many school zones have 15 mph limits and when there are kids about people may go even slower. At the same time, the general rule in CA for school zone is 25 mph. Clearly the car had some level of caution which is good.

calchris42··on Ask HN: What Are You Working On? (June 2025)
You can watch without a subscription. But unless you have YouTube premium, they can inject ads into the videos.

I don’t add any ads.

calchris42··on Ask HN: What Are You Working On? (June 2025)
Thanks! Any and all feedback always appreciated. It’s been fun pulling together.
calchris42··on Ask HN: What Are You Working On? (June 2025)
https://selectube.app/ Working on curated YouTube for kids. Trying to make a place where my kids can watch the good stuff without getting sucked into all the mindless junk.

Also it’s been a fun excuse to try out Cursor and other AI tools I don’t normally use in my day job.

I have 1 user - my 8 yr old son.

calchris42··on Musk’s desire to own the Libs is alienating the buyers of Teslas
Yep. Not great data science, although the conclusion is likely true-ish.

Also I suspect big urban vs suburban vs rural differences in current EV buyers given range and charging factors. That happens to also mostly correlate to politics.

calchris42··on Video gaming may be associated with better cognitive performance in children
Many times, the best solutions are very simple. These often seem obvious in hindsight, but were at the time either non-obvious or dismissed prematurely.
calchris42··on The optimal amount of fraud is non-zero
Your explanation is so much more succinct than the article!

I believe buried in there is one other factor that is somewhat related:

- reducing friction helps drive more legitimate business. Accordingly, over-aggressive anti-fraud practices can result in reduced sales.

A toy example: a business could eliminate exposure to credit card fraud by not accepting credit cards. That would however reduce overall sales.

I guess this can all fit within a “marginal cost” explanation though.

calchris42··on Ask HN: Having trouble getting senior applicants, wondering what to do about it
Totally not equivalent in my view. In traditional interviews, I’m also interviewing the company to see if I want to work with these people.

A take home assignment only shows me that they like unpaid work.

calchris42··on We analyzed 100K technical interviews to see where the best performers work
Despite all the caveats / problems on statistical significance and methodology, 1 key takeaway:

“Unemployed” engineers communicate better than those at Uber, Twitter, Amazon, and Google.

:)

calchris42··on The wine tasting event: Distinguishing reds from whites (2014)
Was wondering how much temperature matters, and thinking probably a lot. Do I even know what room temperature white wine tastes like? Not really.
calchris42··on Ask HN: Why is there no high quality method for voice control of a PC?
Wow, so many replies that boil down to “because typing is better, you should just type”.

This is fairly insulting as RSI’s are very much a real thing.

Does this community also think that wheelchair ramps should never be invested in because stairs are clearly superior?

I’d rather see the brain power in this community focused on solutions. Keyboard + mouse have lasted so long because they work surprisingly well, but I hope there is a day that we dream up something better that does not require slowly giving ourselves carpel tunnel.

calchris42··on Poll: Why are people leaving their jobs?
+1 anecdotally I think it is often a combination of factors. And once you start looking/ exploring and realize you can get a comp adjustment, then that becomes an easily quantified motivator to pull the trigger.
calchris42··on Ask HN: How do I manage the profit of a successful website?
Super helpful. I didn’t know about individual 401k’s.

Thank you!

calchris42··on Germany pauses AstraZeneca vaccinations as a 'precaution'
We will at some point have vaccinated the true believers and be left convincing the rest of the population to get their shots. From that perspective, taking action to demonstrate that we are being absolutely rigorous on the safety of the vaccines might be the global optimal in terms of minimizing time to herd immunity. Especially if we keep manufacturing the shots while studying the data.

Just a thought with zero data behind it...

calchris42··on Has Y Combinator lost its way when the latest company is a Mac only widget?
The Office has already solved unified notifications... WUPH! https://youtu.be/15whn40EQww

Edit: or perhaps anti-unified...

calchris42··on Toshiba Unveils First FC-MAMR HDD: 18 TB, Helium Filled
I believe helium is used due to it being more effective than air at removing heat. Vacuum is significantly less effective (as in, no convection in a vacuum)
calchris42··on TSMC Kicks Off Volume Production of 7nm Chips
Yields will suffer with current DUV process which must be multiple, multiple patterning. The mentioned switch to EUV reduces multiple patterning and should improve yield. But EUV has had its own challenges.
calchris42··on Many Bitcoin Miners Are at Risk of Turning Unprofitable
Exactly this.

Bitcoin as it stands is the definition of inefficient. Consuming vast amounts of energy for no purpose. Yes, there are ever-changing explanatiins for Bitcoin's usefulness. But there is no fundamental reason why massive energy consumption is required to store digital value, or to make a transaction across borders.

As it stands, Bitcoin is actively bad for the world. We need more energy efficiency, not get rich schemes combined with electric heating for empty warehouses.

There are likely good uses that will come from crypto tech, but this doesn't seem to be it. (And I'm not knowledgeable enough to guess what they will be)

calchris42··on Solar City's Debt Burdens Tesla
Just for my own understanding. .. if an article is interesting, but title is click bait, is it really considered better to make up my own title vs. use the author's title? I could see arguments both ways.
calchris42··on Why Toys?
It strikes me that SW is a key reason for any shift toward a toy-first mentality. Most of the arguments in the article make sense when a (SW) product can be rapidly iterated. Physical products likely tend to be harder to start too toyish... well, except for when they are toys.
calchris42··on SureFly – a personal helicopter designed for safe and easy flight
400 lbs capacity for passengers / cargo is in line with an R22, a common 2 seater helicopter (389 lbs for Pilot, Passenger and Baggage). However the SureFly situation is likely worse than that. Typically the empty weight does not include fuel weight, which might be another 100 lbs.

It seems that SureFly has designed an aircraft with less than half the range of an R22, that can't autorotate, and costs roughly the same. The SureFly might be easier to fly though.

https://robinsonheli.com/r22-series/

calchris42··on Benchmark of 100 crowdfunding videos reveals what works and how much to spend
Can any causality be shown? I'd think there is likely a correlation between money spent on the promo video and the amount of resources, name recognition, e-mail lists, etc that a company already has prior to running the campaign.
calchris42··on Google Splits Hangouts into Chat and Meet
Their newer approach of different products targeted at consumer vs. business use cases has some merrit. All/Duo for consumer, Hangouts Chat/Meet for business. The needs are different and one size fits all often means one size ideal for nobody.
calchris42··on Snap values itself at nearly $24B with its IPO pricing
And here I was thinking he was saying I should invest in Pringles. :P
calchris42··on Ask HN: How would you turn Twitter around?
> Ain't nobody got time to read all that crap.

+10 to this. The signal to noise on Twitter is terrible.

Pretty sure I'm using it "wrong", but my likelihood of following someone on Twitter is generally inversely proportional to their number of tweets per day.

calchris42··on What I Heard from Trump Supporters
After the election, my wife's first reaction was to cry. Her second reaction was "man, this shows we really don't understand a lot of people in our country." I applaud Sam for getting out and trying to improve his understanding.

I think Trump is very dangerous for our country. But that does not mean the people who voted for him are all evil bigots. On the left, we need to work harder to fight the more dangerous policy aspects, while not demonizing half our country. At the women's march post-inauguration, I was a bit taken aback by how hateful and not-conducive-to-fruitful-discussion many of the slogans were.

I don't really agree with the premise that America is no longer great. But anyway, I've had the thought that if we really want to "Make America Great again", a key starting point would be to reduce the hateful polarization.

calchris42··on How much does employee turnover really cost?
It seems to me that the money question confounds two factors. As I recall (possibly incorrectly), studies find that increased pay doesn't correlate with increased work / productivity. That's probably true. If I'm working on a problem that I want to be working on, it would take relatively large swings in pay to motivate me to work more or less hard than I otherwise would.

And yet I'd bet that money does have a significant correlation with retention and satisfaction. Perception of insufficient raises will certainly lead to dissatisfaction. Offer of meaningfully more money at a different job --> who wouldn't want that if the work is otherwise as good?

So in other words, productivity != retention.

calchris42··on “video” conferencing with 1% the bandwidth?
Author here. Very curious of HN community's thoughts on this idea. Would you use such a system? What for? Why or why not?

We're considering whether to build out the avatar conferencing system. As mentioned in the blog, there are some obvious pluses and minuses to such an idea, and likely a lot of less obvious ones not mentioned. Thanks!

calchris42··on Video conferencing without the video
Cool. Looks like that is on Netflix, so will have to check it out.

Do they make the idea look promising? Or really dumb?

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