Hacker News: aptitude_moo

New comment by aptitude_moo in "This map is not upside down"

aptitude_moo — Fri, 19 Sep 2025 00:35:22 +0000

Just to clarify, it might be official but I'm argentinean and I never saw a map like this with south on top

New comment by aptitude_moo in "Nuclear fusion: WEST beats the world record for plasma duration"

aptitude_moo — Tue, 18 Feb 2025 22:31:54 +0000

I don't know much about this but I assume that the tritium will be created somehow while fussion is done [1]

[1] https://en.m.wikipedia.org/wiki/Deuterium%E2%80%93tritium_fu...

New comment by aptitude_moo in "Twenty Years of Valgrind (2022)"

aptitude_moo — Thu, 29 Aug 2024 02:37:47 +0000

> As a result, I don’t have much use for Memcheck, but I still use Cachegrind, Callgrind, and DHAT all the time. I’m amazed that I’m still using Cachegrind today, given that it has hardly changed in twenty years. (I only use it for instruction counts, though. I wouldn’t trust the icache/dcache results at all given that they come from a best-guess simulation of an AMD Athlon circa 2002.)

The few times I used the cache simulator and compared it to (Linux) Perf I found reasonable results. Someone can recommend a better cache simulator?

New comment by aptitude_moo in "How many photons are received per bit transmitted from Voyager 1?"

aptitude_moo — Tue, 04 Jun 2024 04:44:43 +0000

Weird, it works for me. You can use any of the other published links in the sibling comments. The name of the paper is "Quantum Limits in Optical Communications" by Banaszek

New comment by aptitude_moo in "How many photons are received per bit transmitted from Voyager 1?"

aptitude_moo — Mon, 03 Jun 2024 14:54:59 +0000

Very interesting, I studied telecommunications and I thought the Shannon limit was the absolute limit. I wonder now if this Gordon Holevo limit is applicable for "traditional" telecommunications (like 5G) as opposed to photon counting a deep space probe

EDIT: This paper seems to answer my question [1]

[1] https://opg.optica.org/directpdfaccess/8711ab35-bbc2-4d51-8e...

New comment by aptitude_moo in "A Woman Who Spent Five Hundred Days in a Cave"

aptitude_moo — Mon, 22 Jan 2024 00:25:18 +0000

Thank you!

New comment by aptitude_moo in "A Woman Who Spent Five Hundred Days in a Cave"

aptitude_moo — Sun, 21 Jan 2024 15:51:41 +0000

Do you have more info? I googled quickly with the "fake" and "staged" keywords and found nothing

New comment by aptitude_moo in "Earthquake in Japan yesterday may have shifted land 1.3 meters"

aptitude_moo — Tue, 02 Jan 2024 19:15:51 +0000

Obligatory XKCD: https://xkcd.com/2029/

New comment by aptitude_moo in "Light can be reflected not only in space but also in time"

aptitude_moo — Thu, 07 Dec 2023 14:32:08 +0000

Not entirely sure what time reflection is, but I'm pretty sure it doesn't mean anything related to anything going backward in time. Here I think it's explained better https://spectrum.ieee.org/time-reversal-interface

Edit: Now that I've read a bit more, it seems to me this is just reflecting light back but "all at once". Like if a light signal were a train going right and the first wagon is A (>>>[D][C][B][A]>>>), a normal mirror would make it bounce and the train would go back going left and wagon A arrives first (<<<[A][B][C][D]<<<). A """time reflection""" would make the train return backwards and wagon D arrives first like this (<<<[D][C][B][A]<<<). I understand it is like reflecting each wagon at the same time so the train comes back reversed. This looks cool but I think the article deliberatively makes it confusing so it sound like the movie TENET when it starts talking about entropy

New comment by aptitude_moo in "Why the original transformer figure is wrong, and some other tidbits about LLMs"

aptitude_moo — Wed, 24 May 2023 17:00:09 +0000

I find this one as the most complete [1] [2]

[1]: https://github.com/ajhalthor/Transformer-Neural-Network/blob...

[2]: https://www.youtube.com/watch?v=Nw_PJdmydZY&list=PLTl9hO2Oob...

New comment by aptitude_moo in "Stellarium 1.0"

aptitude_moo — Sun, 02 Oct 2022 06:49:48 +0000

The web version is a bit of a different project. Make sure to try the desktop version!