jcarreiro

7 ms·

1.
by jcarreiro 7mo ago
There are many, many more tax returns filed by people earning under 200k adjusted gross income than those earning more, I assume. So if there's a uniform chance that a return is audited, we would expect most audits to be done on return
2.
by jcarreiro 8mo ago
The paper says that: > In practice, we find that four Taylor terms (P = 4) suffice for recovering conventional attention with elementwise errors of approximately the same magnitude as Float16 resolution, acceptable for many AI applicatio
3.
by jcarreiro 2y ago
This must be facetious? A GFCI breaker in a house's electrical panel and any breakers present in the transformer on the utility pole are protecting against _very_ different scenarios -- the breaker in the house is to stop someone from
4.
by jcarreiro 2y ago
> The problem with that is then you need a mechanism that creates non-uniformly distributed mass. The mechanism is gravity; and we have good observational evidence that the mass distribution of the universe is not uniform, at least at th
5.
by jcarreiro 3y ago
Sadly, this is not possible, at least AFAIK. The basic problem is that a gravitational wave won't push against you, like a water wave would; the wave will pass through you. See https://worldbuilding.stackexchange.com/qu
6.
by jcarreiro 4y ago
Because they are researching inertial confinement fusion, not trying to build a working power plant. The efficiency of the lasers doesn't matter, since it doesn't affect their research.
7.
by jcarreiro 4y ago
You can download a version without the watermarks from arXiv: https://arxiv.org/abs/1804.03719 .
8.
by jcarreiro 9y ago
So if HN added advertising to support the site, you would totally stop posting here, right?
9.
by jcarreiro 9y ago
This is a good observation, but gravitational lensing surveys have all but eliminated massive compact objects as a potential source of dark matter; see for example https://www.ncbi.nlm.nih.gov/pubmed/17359015 .
10.
by jcarreiro 11y ago
"The period for which reasonably reliable instrumental records of near-surface temperature exist with quasi-global coverage is generally considered to begin around 1850. Earlier records exist, but with sparser coverage and less standar
11.
by jcarreiro 11y ago
This article is not about FRBs: Earlier this year, Swinburne University's Emily Petroff was the lead author of a report on the first observation of a fast radio burst (FRB) in real time. Previously, the enormously powerful but poorly
12.
by jcarreiro 12y ago
The convenience is hard to beat. I recently switched from a drip coffee maker to a Keurig, and I love it. My wife and I don't drink much coffee and so making 12 cups is a huge waste, we end up throwing away 3/4 of the pot. I also
13.
by jcarreiro 12y ago
It's a bash bug because the bug is ultimately in how bash parses environment variables. My understanding is quite limited, but IIUC, after the invalid function definition, the bash parser simply stops trying to parse the environment, a
14.
by jcarreiro 12y ago
You can do this in Preview.app. :) Edited to add: BTW, Shift+Cmd+4 is a super useful shortcut from taking screen grabs on the Mac.
15.
by jcarreiro 13y ago
> Where the F#?k is Dexter when you need him? Vigilantism is not the answer.
16.
by jcarreiro 14y ago
The "decoder" rat was not trained beforehand, unless I am badly misreading the article. The training process that occurred used the real-time signal from the "encoder" rat's brain. It simply took some time for the "decoder" to learn how to
17.
by jcarreiro 14y ago
According to the article, "Servicemembers from the tank brigade that found the crater have confirmed that background radiation levels at the site are normal", and "Background radiation levels in Chelyabinsk remain unchanged, the Emergency M
18.
by jcarreiro 14y ago
Ah! I did not know that. Thanks for informing me, I'm happy I got the chance to learn something new today. :)
19.
by jcarreiro 14y ago
It is very nice penmanship. Nice to see skills like this still around. From the article: It’s clear that it is mostly, but not completely handmade, as although the included paper is weathered all of the “handwriting” and calligraphy lack
20.
by jcarreiro 14y ago
> I guess you'd fill the capsule with 'locally sourced' air There is no air on the moon, so this doesn't seem likely.
21.
by jcarreiro 14y ago
I believe their argument stems not so much from the intelligence of cetaceans -- as others have pointed out, intelligence is hard to define -- but from evidence that they are self-aware, conscious beings.
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by jcarreiro 14y ago
Where exactly in that article does the author make any sort of argument that would support his thesis?
23.
by jcarreiro 14y ago
This is part of NASA's Planetary Protection directive [1]. Their goal is to ensure that we do not inadvertently contaminate the pristine environments that we visit with our spacecraft. If we did, we would be destroying an invaluable scienti
24.
by jcarreiro 14y ago
> Doesn't mars also lack a magnetic field? Yes, that's correct. There is no global dipole magnetic field on Mars [1]. However there are weak fields "frozen" into some of the oldest rocks on Mars [2], which indicates that the pla
25.
by jcarreiro 14y ago
> the most interesting things you can see are the dust > devils and maybe/hopefully, ice formations For the geologists who designed the scientific instruments on Curiosity, the most interesting things they can see are rock
26.
by jcarreiro 14y ago
> Is it silent on Mars? Good question! No, it is not. See http://sprg.ssl.berkeley.edu/marsmic/sound.html for an experiment, carried on the Mars Polar Lander, which would have attempted to record the sounds of Mars. Sadly the
27.
by jcarreiro 14y ago
> But the atmosphere is thinner, so this makes it harder to > hear? Or quieter? Sound intensity for a plane wave is given by the equation $I = \xi^2 \omega^2 c \rho$. Here $\xi$ is the particle displacement (the amplitude
28.
by jcarreiro 14y ago
> around 50km above the surface of Venus, the temperatures > are nice, and the pressure is 1 earth atmosphere. You just > have to to stay up there. Lando Calrissian just called. He wants his Cloud City back. :)
29.
by jcarreiro 14y ago
> I have trouble comprehending the size of other planets I'm not sure this will help, but the surface area of Mars is about 1/3 that of Earth. Given that roughly 2/3 of the Earth's surface is covered by water, one can think of t
30.
by jcarreiro 14y ago
> as I understand, if you could cool it down to an > acceptable temperature, you could walk on the surface > with just a breathing apparatus, right? Sadly, probably not. Cooling it down is already a very tall order,

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