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kevinpet

3,576 karma · joined May 7, 2009

Engineer at Wealthfront. @kdpeterson http://kdpeterson.net/ kevin at my domain.
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kevinpet··on Ask HN: What's the coolest physical thing you've made?
A dictionary reflects current usage. It does not reflect correct usage.

Police in the US are not governed by the UCMJ and have no affirmative obligations in the way military do. They are also civilians under the Geneva convention.

A professional police force only goes back about 200 years.

kevinpet··on Refusing to teach kids math will not improve equity
I thought Scott Alexander's take was interesting https://astralcodexten.substack.com/p/why-match-school-and-s... and the phrase "laundering privilege" stuck with me. It's like a crypto mixer but for privilege.
kevinpet··on Can Chess, with Hexagons? [video]
It doesn't make sense to me why pawns attack on a file (adjoining hexagons) rather than diagonal (hexagon pointed to but separated by the side between two others).
kevinpet··on California needs real math education, not gimmicks
Simple, you teach a very low level spreadsheets course but label is "Data Science". Voila!
kevinpet··on FedEx Accused of Largest Odometer Rollback Fraud in History with Used Vans
This is incorrect. It's easy to find the actual statement required: https://eforms.com/images/2017/06/Federal-Odometer-Disclosur...

> I, ______________________ (SELLER’S NAME, PRINT) state that the odometer now reads ______________________ miles (NO TENTHS) and to the best of my knowledge that it reflects the actual mileage of the vehicle described below, unless one of the following statements is checked.

The seller is only strongly asserting what the odometer reads. If the seller doesn't know anything about that vehicle, then "to the best of [their] knowledge", that reflects the actual mileage.

Also to clarify, none of this is sworn, or "under penalty of perjury"

kevinpet··on Submarine missing near Titanic used a $30 Logitech gamepad for steering
You can have safety, or you can have a submarine tourism startup. You can't have a submarine tourism startup staffed by cautious risk averse people.
kevinpet··on Arizona limits building as groundwater dries up
Ah yes, since we all have an intuitive grasp of what millions of gallons, and can visualize what that means over however many 40 acre farms.
kevinpet··on Lawyer cites fake cases invented by ChatGPT, judge is not amused
It's not clear he deliberately lied. He plausibly misunderstood a new tool he had recently been introduced to.
kevinpet··on The Structure of Scientific Revolutions [pdf]
I find a software parallel here. When building new systems in poorly understood domains, you can't proceed as if you already know the paradigm. Instead you have to poke around and try things until you find a working paradigm.
kevinpet··on Building a Better Book Club: A Strategy for Efficiently Ingesting Nonfiction
I tried Blinkist which seems relevant to the strategy proposed. I listened to summaries of a couple of books I had in fact read and found the summaries superficial and probably focused as much on what people said the book said as what it actually said. I imagine Chatgpt will do the same right now due to available sources of information.
kevinpet··on The professor who made $10B by cutting Google its first startup check
It's not about the investor who makes $10B. It's about the economy that you are able to get when you have incentives for people to take these kinds of risks. The investor making $10B along the way is incidental. I mean, not from his perspective of course, but from society's.
kevinpet··on Wikipedia user edits over 90k uses of “comprised of”
Forgive me if I decline to take writing advice from someone who tells me "I go house" is meaningful English. It isn't. It's violates the rules of grammar, rules which are a description of the normal English as used by members of the English speaking community. English expects you to specify whether you go into, towards, around, out of, or through the window of a house, or the house that we already know we are talking about, or Joe's house.
kevinpet··on SEC charges crypto entrepreneur Justin Sun and his companies for fraud
You don't need to blindly defer to a regulator when they say their authority extends to cover something. For example, the CDC claimed to have authority over evictions https://www.scotusblog.com/2021/08/court-lifts-federal-ban-o...
kevinpet··on The Demise of Silicon Valley Bank
this is incorrect: "FDIC has implied that insured funds (up to $250K per account) will be released within 7 days." Specifically, the FDIC has explicitly stated (rather than implied) that insured funds will be released on Monday (rather than within 7 days). https://www.fdic.gov/news/press-releases/2023/pr23016.html

The same statement also says "The FDIC will pay uninsured depositors an advance dividend within the next week." which I assume means some percentage of the uninsured funds based on a worst case scenario of the recovery.

Another issue is that this isn't just about the company not having funds, but also funds that may have been transiting through SVB today. At least one payroll provider was affected.

kevinpet··on FDIC Takes over Silicon Valley Bank
All men are mortal. My cat is mortal. Therefore my cat is a man.

Not all mortgage backed securities are subprime CDO squareds.

kevinpet··on Mars will have a lot of wicker furniture
I had thought that iron would be the material of choice, especially early enough that elemental iron in the form of meteorites is readily available. All it requires is heat, meaning electricity.
kevinpet··on Lab leak most likely origin of Covid-19 pandemic, U.S. agency now says
If you are not a native English speaker, you may want to know that you are pretty drastically misreading parents comment. He is not saying "I know this specific virus is present" but "the lab studied SARS related coronaviruses" which you in fact seem to agree with.
kevinpet··on Google stock tumbles 8% after its Bard AI ad shows inaccurate answer
The irony is this type of business writing is going to be among the first replaced by AI (it already is in local sports), because this sort of vacuous "mention some things that relate to each other" approximation to correctness is a standard that chat bots have already reached.
kevinpet··on The Mystery of Richard Posner
I think you're failing to consider the selection bias in those who have had the chance to ask the question of. By definition your clients are people who are able to hire lawyers. They aren't the target market for robot lawyers, not for a long time.
kevinpet··on Crime App 'Citizen' Lays Off Dozens of Employees
I've been on the other side of it, and your approach can come across as childish, like arguing with your math teacher that billy couldn't have eaten 4/6 or 2/3 of the pizza because he'd get sick.

It's a _hypothetical_. The problem needs to be constrained because realistic problems often either 1) have standard answers that don't require real thought or 2) are too hard to solve in an interview. Asking how you'd solve some problem on a CPU that doesn't support multiplication or something shows whether you have skills that could transfer to solving real problems but can be asked more quickly.

kevinpet··on ‘Breakthrough’ obesity drugs that have stunned researchers
I rarely eat junk food, and I'm fat.

Your attitude is the same as a religious person telling depressed people they need jesus rather than prozac.

kevinpet··on Findings from 3,300-year-old Uluburun shipwreck reveal complex trade network
That is not in fact how science works.

Science only welcomes new ideas when they offer a possible solution to a problem with the existing paradigms. For this type of theory, if you had data showing the earliest known societies were unusually advanced, or if you had artifacts that suggest more wide spread early societies, these would be facts wanting an explanation.

You can't just say something like "maybe all language was singing until 20,000 years ago" and claim it's scientific until proven false.

kevinpet··on American EVs reduced gasoline consumption by just 0.54% in 2021
I think your arguments would be more effective if you removed the tribalism from your politics. Leftists are not consistent friends to nuclear power and in fact nuclear power generation does not seem to have any relation to a states partisan lean: https://www.statista.com/statistics/187270/us-nuclear-power-...
kevinpet··on American EVs reduced gasoline consumption by just 0.54% in 2021
But not from a total lifecycle perspective. 100000 miles at 25 mpg at $5/gal is $20,000, and that's spread out over the ten years you drive those 100,000 miles. Add in another few thousand in extra maintenance costs for gasoline, subtract out a few thousand for the cost of charging at home, subtract out a bit more to get the charger installed, and for a full size car the fuel savings are about $12,000 up front.

For compact cars comparable to cars that get better mileage, that's less.

kevinpet··on FTX was registered with and licensed by the CFTC, which failed to regulate FTX
This comment undermines the whole story and shows that bettermarkets isn't interested in reality, only pushing their agenda.
kevinpet··on Purchasing Power Parity: Fair pricing for SaaS products
I encourage the author to take an economics class. There's a common trend of smart people trying to fumble through what amount to the first semester of economics. Even a brief exposure gives you enough knowledge to know the name of what you are interested in.

In this case, it's an argument for price discrimination -- charging different prices to different buyers based on their willingness to pay. And in fact "textbooks" is one of the examples given on https://en.wikipedia.org/wiki/Price_discrimination#Textbooks

This allows you to lean on what's already known. Specifically, identifying market segments with different elasticity and enforcing the scheme.

Have people started using the phrase "purchasing power parity" to refer to a pricing scheme that corrects for PPP? I think "parity" might be leading people astray because it actually just refers to an adjustment to GDP or other indicators for purchasing power. It doesn't refer to a pricing scheme. I could suggest the name "Purchasing Power Parity Pricing" if you want something you can say you "support".

(That said: I think this is isolated to extremely high margin goods and will not translate to others.)

kevinpet··on macOS Ventura is now available
> duplicate detection in Photos

What? Finally!

kevinpet··on Never trust a system that seems to be working
Failure at the bottom of a steep hill is a different type of failure caused by brake fade due to the brake drum swelling with heat as the truck goes down the hill.
kevinpet··on Someday aliens will land and all will be fine until we explain our calendar
It might actually have been easier. Our current time system is regular enough that you can get away with skipping many irregularities (leap year is pretty much the one that matters). If you were forced to regularly deal with time conversions, you would just accept that different people have different times and you just need to convert.
kevinpet··on Charging cars at home at night is not the way to go: study
I don't have an electric car, but I can't imagine this is a challenging problem at all. All you need is a target charge level. If you're going on a trip tomorrow, set it to 100%. If your normal commute is 20 minutes, no reason to charge past 75% or even 50%.
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