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Ask HN: Teach me something new

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Re: Ask HN: Teach me something new

#81
post #62

You can play Morse code from your bash scripts. For instance: echo "hello world" | cw -w 18 -e (install with 'sudo install cw')

and for the curious -- cw stands for Continuous Wave, a radio term for signaling that's turned on and off (like Morse code -- as opposed to modulated like AM, FM, etc).

Re: Ask HN: Teach me something new

#82

I'm going to go a bit random...get a styptic pencil! Nobody I've met even knows what they are. I came across them years ago in the shaving section, and was blown away by their utility. They are solid pieces of some saltlike material that are super effective at stopping bleeding. We don't even have bandaids in our house anymore, the pencils are way more useful.

We used them in the Navy!

Curious...for what purpose?

I'd read the Army used to pack wounds with basically a crushed version of the same thing.

Re: Ask HN: Teach me something new

#83

Earlier quoted context omitted.

I have experienced this several times and almost never have a headache. I definitely can't read what's beyond/obscured by the scotoma. The first time it happened was during a test in high school and the splotch grew until I was forced to read the questions in my peripheral. I have an anecdote that corroborates your observation that cognitive experiences are more complicated then assumed: I was once very, very sleep d…

One of the other weird things I referred to is best described as discovering that I could be awake and asleep at the same time. I think it might be another case of our naive ideas about cognitive processes being a little oversimplified. It sounds like nonsense, of course, but that's because we naively assume that sleep and wakefulness are opposites--that they are mutually exclusive. What if we're wrong about that? Wh…

Being aware while asleep is something that can happen to advanced meditators. The more aware you are the more you are there is no difference between being awake or asleep. I haven’t heard it brought up in any other contexts except maybe for lucid dream practitioners. I’ve also read accounts from those who have done dark room retreats where perception of being awake and asleep blur and the perception of what you are experiencing has a lot of mind generated in experiences that can seem very real, dream-like, or using Buddhist language, empty.

Re: Ask HN: Teach me something new

#84

I have tinnitus. Before I had tinnitus I could simply use earplugs. Problem when I sleep: when I use earplugs it presses in my ear and it aggrevates my tinnitus. Solution: - Bose QC 35 - Earplugs Now the earplugs don't get pushed in and don't aggrevate the tinnitus. The bose QC 35 gets pushed onto whatever is directly outside your ear, which is a bit uncomfortable but fine. This is my new earplugs setup and it works.

I cut the earplugs in half and use the tip. It’s a bit annoying to take them out. I’ve once had to resort to tweezers.

Also if you’re a regular earplug user, you can get something like: https://www.amazon.com/dp/B00W3DE3BO

I have these and cut off the stalks. They’re easy to take out and don’t get pushed in.

Finally, there are (more expensive) “concert earplugs designed to retain the auditory experience while reducing loudness only. Worth checking out if you like your hearing but are often in loud environments.

Re: Ask HN: Teach me something new

#85

People have always and will always think that the time they are living in is the most important time ever. This is a self evident fallacy or a universal truth. These times we are living in are not the most important. Or, of they are, then everyone everywhere is at everytime living at the same importance. Now, there is something called the hinge of history that some mathematicians have looked into the chance of "well…

But… we do live in the most important time. We’re alive, and everyone else is dead. We can do things; they can’t.

I don’t know what’s more important than that.

Re: Ask HN: Teach me something new

#87

People have always and will always think that the time they are living in is the most important time ever. This is a self evident fallacy or a universal truth. These times we are living in are not the most important. Or, of they are, then everyone everywhere is at everytime living at the same importance. Now, there is something called the hinge of history that some mathematicians have looked into the chance of "well…

But… we do live in the most important time. We’re alive, and everyone else is dead. We can do things; they can’t. I don’t know what’s more important than that.

Your parent covers that under, (paraphrasing) 'if we are, everyone always is'.

Re: Ask HN: Teach me something new

#88
Upon a cursory inspection of the first 10,000 or so early GitHub users, it takes about 64 followers to be in the top 20% of followed GitHub accounts.[1]

Users with 100 or more followers can often be business owners, well known employees from FAANG companies and the like.

Users with 1000 or more followers tend to be specialists in lesser used technologies who have created open source technologies used widely in that specific domain.

Users with 10000 or more followers tend to be luminaries who have created technologies most people in the industry are familiar with, like say coffeescript.

[1]: https://github.com/andrewmcwattersandco/github-statistics

Re: Ask HN: Teach me something new

#89
The big bang was extremely hot; the universe now is quite cold (microwave background). It was a continuous process of cooling, implying that there was an interval where the entire universe was comfortable (there are at least a few papers on this, e.g. https://arxiv.org/abs/1312.0613 , but I like it more just as a strange thing to thing about).

Re: Ask HN: Teach me something new

#90
The Hong Kong–Zhuhai–Macau Bridge (HZMB) is a 55km (34mi) bridge–tunnel system consisting of a series of three cable-stayed bridges, an undersea tunnel, and four artificial islands. It is both the longest sea crossing and the longest open-sea fixed link in the world. Designed to last for 120 years and built from 2009-2018 at a cost of USD$18.8B, it is currently almost completely vacant due to COVID.
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