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Using elliptic curves to solve a math meme

https://artofproblemsolving.com/community/c2532359h2760821_the_emoji_problem__part_i?srsltid=AfmBOor9TbMq_A7hGHSJGfoWaa2HNzducSYZu35d_LFlCSNLXpvt-pdS
49•mtsolitary•59m ago•4 comments

The Behavior of LLMs in Hiring Decisions: Systemic Biases in Candidate Selection

https://davidrozado.substack.com/p/the-strange-behavior-of-llms-in-hiring
47•hunglee2•1h ago•16 comments

Making Video Games (Without an Engine) in 2025

https://noelberry.ca/posts/making_games_in_2025/
208•selvan•5h ago•85 comments

A simple search engine from scratch

https://bernsteinbear.com/blog/simple-search/
17•bertman•1h ago•0 comments

DDoSecrets publishes 410 GB of heap dumps, hacked from TeleMessage

https://micahflee.com/ddosecrets-publishes-410-gb-of-heap-dumps-hacked-from-telemessages-archive-server/
469•micahflee•10h ago•118 comments

The Windows Subsystem for Linux is now open source

https://blogs.windows.com/windowsdeveloper/2025/05/19/the-windows-subsystem-for-linux-is-now-open-source/
1356•pentagrama•19h ago•906 comments

Finland announces migration of its rail network to international gauge

https://www.trenvista.net/en/news/rnhs/finland-migration-standard-gauge/
218•axelfontaine•3h ago•174 comments

Have I Been Pwned 2.0

https://www.troyhunt.com/have-i-been-pwned-2-0-is-now-live/
607•LorenDB•13h ago•197 comments

Jules: An Asynchronous Coding Agent

https://jules.google/
356•travisennis•14h ago•140 comments

Show HN: Metal – stealth browser for enterprise automations

https://metalsecurity.io
7•erekp•1h ago•5 comments

Zod 4

https://zod.dev/v4
716•bpierre•19h ago•215 comments

What are people doing? Live-ish estimates based on global population dynamics

https://humans.maxcomperatore.com/
159•willbc•9h ago•71 comments

I got fooled by AI-for-science hype–here's what it taught me

https://www.understandingai.org/p/i-got-fooled-by-ai-for-science-hypeheres
183•qianli_cs•6h ago•132 comments

GitHub Copilot Coding Agent

https://github.blog/changelog/2025-05-19-github-copilot-coding-agent-in-public-preview/
455•net01•18h ago•273 comments

Imagine a drive where every file exists as all file types all of the time

https://anydocai.com/
4•grandslammer•3d ago•4 comments

Questioning Representational Optimism in Deep Learning

https://github.com/akarshkumar0101/fer
20•mattdesl•4h ago•2 comments

Claude Code SDK

https://docs.anthropic.com/en/docs/claude-code/sdk
358•sync•17h ago•162 comments

Launch HN: Better Auth (YC X25) – Authentication Framework for TypeScript

221•bekacru•20h ago•83 comments

AI's energy footprint

https://www.technologyreview.com/2025/05/20/1116327/ai-energy-usage-climate-footprint-big-tech/
20•pseudolus•1h ago•7 comments

Run GitHub Actions locally

https://github.com/nektos/act
244•flashblaze•4d ago•98 comments

Ann, the Small Annotation Server

https://mccd.space/posts/design-pitch-ann/
46•todsacerdoti•7h ago•9 comments

A shower thought turned into a Collatz visualization

https://abstractnonsense.com/collatz/
113•abstractbill•10h ago•20 comments

Biff – a batteries-included web framework for Clojure

https://biffweb.com
44•TheWiggles•8h ago•10 comments

Kilo: A text editor in less than 1000 LOC with syntax highlight and search

https://github.com/antirez/kilo
149•klaussilveira•14h ago•24 comments

Game theory illustrated by an animated cartoon game

https://ncase.me/trust/
308•felineflock•18h ago•50 comments

A man who visited every country in the world without boarding a plane (2023)

https://www.theguardian.com/travel/2023/aug/16/take-the-high-road-the-man-who-visited-every-country-in-the-world-without-boarding-a-plane
60•thunderbong•3d ago•36 comments

Solving physics-based initial value problems with unsupervised machine learning

https://link.aps.org/doi/10.1103/PhysRevE.111.055302
11•opnac•3d ago•3 comments

Precomputing Transparency Order in 3D

https://jacobdoescode.com/2025/05/18/precomputing-transparency-order-in-3d
6•jacobp100•2d ago•0 comments

The forbidden railway: Vienna-Pyongyang (2008)

http://vienna-pyongyang.blogspot.com/2008/04/how-everything-began.html
202•1317•16h ago•70 comments

Remarks on AI from NZ

https://nealstephenson.substack.com/p/remarks-on-ai-from-nz
166•zdw•4d ago•88 comments
Open in hackernews

A man who visited every country in the world without boarding a plane (2023)

https://www.theguardian.com/travel/2023/aug/16/take-the-high-road-the-man-who-visited-every-country-in-the-world-without-boarding-a-plane
60•thunderbong•3d ago

Comments

gabrielsroka•2d ago
2023
IncreasePosts•6h ago
Every country according to which governing body or society?
doubletwoyou•6h ago
Apparently those 195 recognized by the UN as well as countries like Taiwan. 203 in total according to the article.
userbinator•6h ago
Presumably including North Korea? (Due to https://news.ycombinator.com/item?id=44033310 currently on the front page.)
scott_w•5h ago
The article said all 195 UN countries, so yes.
qw•5h ago
Yes, it's #176 on his list of countries:

https://www.onceuponasaga.dk/journey

omoikane•4h ago
He had a longer blog entry for North Korea, but I like how the FAQ summarized it as "DPRK is a far more normal country than what we are lead to believe".

The rest of the FAQ is great reading as well:

https://www.onceuponasaga.dk/more/faq

lurk2•4h ago
> Propaganda. Isn’t that just telling people what you want them to believe? If so then there’s plenty of it to go around. In the USA the republicans have one story and the democrats have another. DPRK has its version of the events which unfolded throughout and after the Korean War. Is propaganda being spread in DPRK? Yes...I’m sure it is. However I have quickly come to believe that there is far more propaganda being spread outside of DPRK about the country than within it. When I enter a country today I do that with the experience of visiting and analyzing 175 other countries. I’ve been observing DPRK and what I have seen are just people being people. You can’t interact with the people. They are clearly not interested or maybe they are afraid to interact with foreigners. There could be consequences I imagine? DPRK is not a country which promotes individual freedom.

You don’t say…

lifthrasiir•3h ago
I think the GP is meant to say that it is somehow a functioning country (contrary to what clueless westerners believe), but that doesn't mean that it is [EDIT: was "isn't"] in the good state. Just that the belief is too strong to be true.

Added 2025-05-20T08:40: I realized what happened, double negations ruined the comment. I'm very much aware that DPRK has serious human rights problem and economic issues (after all, I am South Korean), and it also makes use of a western curiosity for business, but they are often exaggerated to the completely impossible extent.

dgfitz•3h ago
They recently held the Olympics, yes they are a functioning country. Or are westerners too clueless to make that connection?

A functioning country is the bare minimum requirement. The recount of experience here does not mean that somehow the country isn’t horribly repressed and poverty-stricken.

lifthrasiir•3h ago
You are definitely confusing North Korea (DPRK) and South Korea (ROK) from each other.
Stealthisbook•5h ago
Graham Hughes did that years ago.

https://en.m.wikipedia.org/wiki/Graham_Hughes

gregorvand•5h ago
"Then came his eureka moment: “I discovered that no one had ever gone to every country in the world completely without flying [in one unbroken trip].” (A British man, Graham Hughes, has set foot in every country without flying, but took two breaks from the journey for personal reasons.)"
sandspar•5h ago
I'm struck by his quotes. They sound like basic advice. "People are generally good, few people want to hurt you" etc. Normally people say this without thinking but with him it's backed up by so much experience. It's hard to share experience. I remember seeing a man whose son was murdered in a shooting. He kept trying to describe his pain, using simple, profound language. I felt sorry for him because of course few people in the audience could relate to him. So his words kind of went in one ear and out the other, at least for me. It's hard to know how deeply truthful something is unless you've lived it. I imagine that this guy in the article may feel very lonely sometimes. Plus it's hard to be "post adventure" etc. Olympic athletes and astronauts etc always talk about how hard it is to be on the other side of the mountain. "What now?"
akoboldfrying•4h ago
> without boarding a plane

Speedrunning tip for future contenders: Be born inside a plane

dmurray•58m ago
Or have one built around you.
Caelus9•4h ago
The first person in the world?
WillAdams•1m ago
This was done back in Victorian times by an Englishman using nothing more than a visiting card and a letter of credit from his bank.

I have been led to believe that it is:

https://www.goodreads.com/book/show/133405977-an-overland-jo...

which arguably should be contrasted with:

https://goodreads.com/book/show/5144131-a-woman-s-journey-ro...

The history of circumnavigations, and the books about it are an interesting set:

- sailing: https://www.goodreads.com/book/show/881902.Sailing_Alone_aro...

- bicycle: https://www.goodreads.com/book/show/301255.Around_the_World_... (all the mroe remarkable since it was a penny farthing rather than the essentially contemporary "safety bicycle" invented shortly after his departure

Those are in the public domain, and I recommend them highly as a view of what the world was once like, and how people are still much the same.

Been meaning to read newer accounts, but still need to track down copies and decide which are worth reading:

- amphibious landing vehicle: https://goodreads.com/book/show/17208213-half-safe

- walking: https://www.goodreads.com/book/show/436398.Letters_From_Stev...

- human power: https://www.goodreads.com/book/show/5215427

- air: https://www.goodreads.com/book/show/23167711-first-flight-ar...

- submarine (submerged): https://www.goodreads.com/book/show/1018686.Around_the_World...

(obviously, this is something of an interest of mine, having been delighted by: https://www.goodreads.com/book/show/54479.Around_the_World_i... when I was younger)

londons_explore•3h ago
How many hours did he spend being interviewed for visas etc?

Some countries I cross off my 'worth visiting' list simply because they have a Byzantine and expensive visa process which is going to use at least a week of time and effort to navigate whilst I was only planning to visit the place for a week in the first place!

And some countries have a 'not allowed if you've ever been to this other country' rule, making it very hard to visit them all.

ycombinete•3h ago
He's Danish.

Danes have visa-free entry to 189/195 countries: https://en.wikipedia.org/wiki/Henley_Passport_Index

So I guess that he had to do about 6 visa interviews.

bloak•15m ago
Thanks for that link, but Denmark's "189" seems to be out of 227 ("all 227 possible travel destinations for which travel restriction information exists in the IATA database"), while 195 is the number of "states recognised by the UN".
darkstar_16•1h ago
As an Indian, this was also my immediate thought but then I read the About section, I figured it was easy/ier for him. The not allowed if visited another place rule must have been easier to circumvent with some planning.
wkat4242•49m ago
> And some countries have a 'not allowed if you've ever been to this other country' rule, making it very hard to visit them all.

In Holland this was a valid reason to request two passports, like if you frequently travel to both Israel and Egypt. They are mutually exclusive.

decimalenough•45m ago
Egypt and Israel have a peace treaty. But eg Saudi Arabia, Libya, Iran etc don't allow Israeli stamps in visitors' passports.
theMMaI•23m ago
Israel doesn't stamp your passport, you get a small paper insert that they stamp instead. Problem is more the other way around, if you have stamps from Iran they won't let you into the country in Israel
vander_elst•3h ago
How can you stay 24+ hours in Vatican City as a tourist? Are there hotels there? It seems there is https://www.residenzapaolovi.com/en/, but it's not within the Vatican.
thinkingemote•3h ago
he slept on the ground. https://www.onceuponasaga.dk/blog/205-how-to-spend-24-hrs-in...
decimalenough•3h ago
His book just came out:

https://www.amazon.com/Impossible-Journey-incredible-through... (not an affiliate link)

And there's a documentary apparently coming out soon.

I followed his journey live on https://www.onceuponasaga.dk/ and it was a weird mix of inspirational and very sad. He was clearly struggling with severe depression towards the end of it, but he could not bring himself to stop, so there he was, squatting in a filthy boat for weeks on end with cockroaches crawling over his toothbrush, while he waited for the country's sole oceangoing cargo ship to be repaired so he could get the hell out of there.

https://www.onceuponasaga.dk/blog/489-most-definitely-possib...

lkuty•2h ago
Sad that it is only available as a Kindle Edition, not a paperback.
wiether•50m ago
I have a paperback version on amazon.fr so it actually exists ; not sure why it's not offered on the .com

https://www.amazon.fr/dp/1472149777/

lifestyleguru•3h ago
Top Scandinavian hipster. Still better than going berserk after alcohol and drugs in Prague, Barcelona, or Ibiza.
aidog•2h ago
I followed Thor's journey over the years. Great dude and a incredible achivement. Imagine planning for 4 years but hanging on for 10! He also had bad luck being stuck during covid.
gaiagraphia•1h ago
Haha, what a small world. He stayed with me in Spain, back in the good old days of Couchsurfing.

Not sure if I feel honoured or guilty by being able to set his plans back a day or 2 by introducing him to the local nightlife...

hakonslie•22m ago
Ah, the good old days of Couchsurfing. So many good memories from 2009, all the way up to 2015, for me.
mellosouls•1h ago
An article from last month in the Guardian:

I visited every country in the world without flying. Here are eight things I learned

https://www.theguardian.com/lifeandstyle/2025/apr/21/i-visit...

darkstar_16•1h ago
I miss reading Blogs. Old school, detailed blogs written in a plain and simple language. It's easy to follow and almost be invested in the journey.