agmm (u/agmm) - Readit News

agmm commented on iPhone 12 withdrawn from French market for non-compliance with EU regulation anfr.fr/liste-actualites/... · Posted by u/patadune

Schiendelman · 2 years ago

If you want caution on something WITH a causal link - don’t eat cooked food!

agmm · 2 years ago

Just to be clear, I don't think that low-power EM radiation poses a health risk. I am just saying that if you are worried about it (like OP is) you can simply reduce your exposure to it. Doing so is relatively easy and has a minimal quality of life impact. As others have mentioned, low-power EM radiation in the frequency range used by cellphones is non-ionizing, so it can't cause cancer or severe health issues in the same way that ionizing radiation can.

agmm commented on iPhone 12 withdrawn from French market for non-compliance with EU regulation anfr.fr/liste-actualites/... · Posted by u/patadune

mwidell · 2 years ago

I love my Apple Watch ultra, because with cellular I can use it as a phone – a very lightweight phone without social media distractions.

But I have to say I am a little bit uneasy about having a cellphone strapped to my arm.

Someone with physics knowledge please calm me down?

agmm · 2 years ago

At the present, we don't have enough evidence to be concerned about low-power EM radiation. However, this does not rule out the possibility that in the future, we might find a causal link between that kind of radiation and adverse health outcomes. What we do know at the moment is that this type of radiation can heat tissues. What are the long-term biological consequences of that? We don't really know. My advice: try to minimize your exposure out of caution, but don't get too worried about it.

agmm commented on macOS command-line tools you might not know about saurabhs.org/advanced-mac... · Posted by u/Gadiguibou

klausa · 2 years ago

`pbcopy` and `pbpaste` are one of my most-loved in the list.

Dealing with some minified json, switching to iTerm, doing `pbpaste | json_pp | pbcopy` and having a clean output is _so_ nice.

agmm · 2 years ago

I like to use `pbcopy` when exporting public keys to external services like GitHub.

`cat ~/.ssh/mykey.pub | pbcopy`

agmm commented on πfs – A data-free filesystem github.com/philipl/pifs... · Posted by u/zapdrive

r3trohack3r · 2 years ago

This is a fallacy. Infinity does not contain all possibilities.

There are an infinite number of integers. You can start at 10 and count up forever, never running out of integers. But no matter how high you count, you’ll never count to “orange” - “orange” is not contained in the sequence of infinite integers.

You’ll need to first prove that every sequence of integers is contained somewhere in pi, since the number of possible integer sequences grows faster than the “space” for sequences in pi. In other words, I can always pick a digit that creates a valid, non repeating, integer sequence from the pool of possible sequences while never creating the integer sequence “123456789123456789123456789.” You’d need to prove that pi doesn’t do this.

Even if pi does contain every sequence of integers and you could map that to bytes which, in turn, maps to a file, this would not compress.

Your metadata directory would be larger than the raw files unless you get very lucky and your file is very early in the sequence of pi.

A byte can represent 256 unique values. 256 unique values can not compress to less than a byte. So if your index is a digit of pi where your file starts, your file starts after some other number of files. Your index is going to be the index inside of the address space of “all possible files.” This will get large very quickly.

agmm · 2 years ago

If π is a normal number, then it contains all possible sequences. However, it is currently unknown whether π is a normal number. I agree with you regarding the fact that this might not be a great compression algorithm, but it is certainly fun.

agmm commented on Gravitational Machines arxiv.org/abs/2305.10470... · Posted by u/sohkamyung

lb1lf · 2 years ago

In a similar vein, John Kraus (Of Antennas... textbook fame) described a gravitational transmitting and receiving system as a fun (?) diversion near the end of the book.

It has been a few years, but I seem to recall that the transmitter was a 500T steel bar spun at very close to the maximum RPM the tensile strength of steel allowed; the radiated energy was something like a fraction of an attowatt. (An attowatt = 1*10^-18W)

There are more efficient transmitting schemes out there.

agmm · 2 years ago

I became curious about this and went to the book to learn more. The system proposed in the book is capable of radiating around 2.2 x 10^-29 W by rotating a bar weighing 500 tonnes about 270 times per minute.

[1] Source: Kraus, J. D. (1988). Antennas (2nd ed., p. 769). Retrieved from https://ia802907.us.archive.org/8/items/KrausAntennas19882ed...