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andrewljohnson

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Co-founder at manapool.com - The Market for Magic Cards

Previously Co-founder, Gaia GPS.

andrew@manapool.com

andrewljohnson@gmail.com

Posts305
Comments1,842
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luckypaper.co 1y ago

The Shuffler Is Broken: Finding the Best Method for Shuffling Cubes

andrewljohnson
2pts0
yungchomsky.substack.com 2y ago

Building Phomo, Part 1: The Calendar

andrewljohnson
2pts0
github.com 2y ago

Large World Model

andrewljohnson
2pts1
orders.fdic.gov 2y ago

Choice Financial Group consent order from FDIC

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3pts2
www.alignmentforum.org 2y ago

When do "brains beat brawn" in chess? An experiment

andrewljohnson
124pts79
manapool.com 2y ago

Show HN: Mana Pool – Market for Magic Cards

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123pts149
techcrunch.com 3y ago

Mozart Data announces free tier

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1pts0
freaktakes.substack.com 4y ago

How we won the war on infectious disease

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3pts0
tedgioia.substack.com 4y ago

When They Had a Contest to Rename Jazz

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2pts0
www.frontiersin.org 4y ago

Effect of Isotonic Saline Nasal Lavages in Improving Symptoms in SARS-CoV-2

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5pts6
sports.yahoo.com 4y ago

Beijing built Olympic ski slopes ‘from scratch’ on the outskirts of a desert

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2pts0
www.amazon.com 4y ago

Monitor the C02 in a Room (not my product)

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5pts5
longreads.com 4y ago

But who tells them what to sing?

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2pts0
lacker.io 4y ago

The Random Number Generator Hypothesis

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2pts1
apnews.com 4y ago

United States issues its first passport with ‘X’ gender marker

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9pts8
freopp.org 4y ago

Is College Worth It? A Comprehensive Return on Investment Analysis

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2pts1
www.chrismeyns.xyz 5y ago

Leibniz and the Ethics of Probability

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1pts0
techcrunch.com 5y ago

In a YC ‘power’ play, Gridware girds $5.3M to save humanity from weather

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1pts0
link.springer.com 5y ago

Consumption of a dark roast coffee blend reduces DNA damage in humans

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4pts1
iterative.ly 5y ago

Amplitude Acquires Iterative.ly

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www.cnbc.com 5y ago

SpaceX accepts Dogecoin as payment to launch ‘DOGE-1 mission to the Moon’

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4pts1
www.politico.com 5y ago

California population drops for first time in state's recorded history

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www.suomigo.net 5y ago

Most Common 9x9 Openings in Go

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www.wsj.com 5y ago

Scientists Eye Potential Culprit Behind Covid-19 Vaccine Allergic Reactions

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5pts1
www.sfchronicle.com 5y ago

Airbnb Denies Refunds for Cancellations Based on Pandemic Stay at Home Orders

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8pts1
www.sfchronicle.com 5y ago

Airbnb Denies Refunds for Cancellations Based on Pandemic Stay at Home Orders

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3pts1
www.channel3000.com 5y ago

DHS: Pass on traditional ‘Cannibal Sandwiches’ this holiday season

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3pts0
www.wsj.com 5y ago

COVID19 vaccine candidate scrapped after false positives on HIV test

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techcrunch.com 5y ago

Paired picks up $1M funding and launches its relationship app for couples

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1pts0
firstround.com 6y ago

Our 6 Must Reads If You’re at a Startup with 30 People

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4pts0

A lot of organizations right now are dealing with the "Claude says..." problem.

It's not that you should never include any AI generated text in a conversation with other engineers, but you mostly shouldn't.

AI is a tool to help you understand/debug/review yourself, but you shouldn't be conferring authority to your AI (because it doesn't understand anything and is often wrong in the text it spews), and you shouldn't be running an AI for other people, they should run it themselves.

You can just look at the diff when you do a pull request, no prayer needed, and if you want it to be “surgical” in that way, your prompt (and agents.md) can be specific.

You can also unit test the function to better assure behavior didn’t change.

LLM editing should be done to produce deterministic output.

That is, the LLM should produce a diff, and the user should accept the diff. It seems like a bad pattern to just tell the LLM to edit any long document without that sort of visibility. Same goes for prose as for code.

eBay already had warehousing ops, I assume larger than tcgplayer’s.

Last year, eBay shut down tcgplayer’s only fulfillment facility in Rochester, NY and switched to using eBay’s facility in Kentucky.

For my marketplace, I was friends with someone who could make it look like not a ghost town for the supply (an established game store with lots of trading cards in stock). Then, we struggled to get more sellers. Then, we found channels to get selllers, which were basically software systems we could build integrations with. The integrations de-risked the proposition for sellers enough to get more traction. Eventually, if you have growing volume, the supplyside just starts coming on its own mostly, and you focus on retaining sellers and growing buyers.

For your marketplace, you could bring the supply-side by Fedexing stuff when you don't have a carrier. You'll have to lose money on the initial shipment, until you can route the jobs to the supplyside. This assumes you think the typical use case for this isn't smuggling.

The amount of jobs may be low enough at first that you can be like "You said Cairo to London, that will be $N." Then, if you can fill the job manually by finding someone somehow, then you add them to the platform and they do the job. If not, you send a prepaid mailing package with a Fedex label to the recipient and they ship it easily, and you subsidize it so it seems like a great deal to them.

Limiting geography seems like a good approach too.

We use Mercury’s treasury account to get yields on cash, and what appeals to me is it is easy to manage. I don’t have to worry about setting up processes to move money around and it’s integrated with my bank account, and we wouldn’t want to switch even for a higher yield… the operational burden is more important to us than yield.

I think the yield is about 3.2% based on how we set it up to be as liquid as possible. We could have accepted less liquidity for more like 3.8%

This is neat, I have a simple CSS effect that I apply to foil cards on my Magic card marketplace site, but I have wondered what it would take to replicate all the different foil effects that a Magic card can come in to be both more varied and more true to life, in a performant way that fits into my CRUD svelte UX.

This almost exact thing happened with me with a hiking app I used to make. We had a 7-day trial when you started the app, but we shipped a release that broke this and made all the paid features immediately paywalled. This led to a big increase in sales and we got rid of the trial forever.

It’s possible that our trial might have worked better if it were like modern iOS trials that start charging you after a certain period, but ours just let you use the paid features for 7 days and then lapsed, and it stifled sales. My theory was people urgently needed the paid features (mostly to download maps for a coming trip) so the trial got in the way of them paying right away.

I find using AI very educational in some respects.

I am way more knowledgeable about SQL than I have ever been, because in the past I knew so little I would lean on team members to do SQL for me. But with AI, I learned all the basics by reading code it produced for me and now I can write SQL from scratch when needed.

Similarly for Tailwind… after having the AI write a lot of Tailwind for me from a cold start in my own Tailwind knowledge, now I know all the classes, and when it’s quicker, I just type them in myself.

In GIS world, a vector tile is a chunk of geographic data (the vectors) limited to a geographic region (the tile boundaries which fit into the projected checkerboard of your map).

You use a vector tile instead of a png or jpeg tile because you don’t want an image representation of the data, you want the raw “vector” data so you can style it, search it, and do other things with it on client devices.

Forget squarespace websites. AI is such a huge time saver for complex front ends. It doesn’t write the whole thing, but you can easily go from screenshot to code you are better off using as a starter than typing it all up yourself. And it’s way easier to make css or tailwind changes to modify components than thinking really hard.

I wonder if MidJourney is still ripping. I’m actually curious if it’s superior to ChatGPT’s Dall-E images… I switched and cancelled my subscription when ChatGPT added images, but I think I was mostly focused on convenience.

It's because it's a great place to HODL for me, since they seem vastly more secure than all the sites that have gone down in thievery and flames over the years.

I think it'd be disingenuous to suggest that there is any safer place to hold crypto, given they are publicly traded, have excellent engineers, have insurance, etc. I even think it's more likely I'd fuck up personally custodying my crypto than letting Coinbase hold it. I've had friends lose so much money trying to keep their crypto in private wallets and on shady exchanges.