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Ask HN: Teach me something new

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Re: Ask HN: Teach me something new

#391

Post by bitwize »

Nick87633 wrote: post #70
larmstrong wrote: post #42

Reptiles (and other ectothermal vertebrates) will “artificially” give themselves fevers by staying in heat sources longer when they’re fighting an infection. It’s called a behavioral fever. https://pubmed.ncbi.nlm.nih.gov/27381718/

I've definitely felt this before, The hot soup, hot tea, sweatpants, sweatshirt, wool hat, get-in-bed I feel like I'm about to have a fever reflex.

I tend to get chills with my fevers. Maybe "chills" in ill mammals are similar instinct, to provoke the urge to bundle up and get warm when it isn't necessary, thus instigating a fever?

Re: Ask HN: Teach me something new

#392

Post by ThinkBeat »

rawoke083600 wrote: post #301

ok I'll have a go ! Here is my favorite mental-model for problem solving (and my favorite analogy) So I have this problem: I love eating scramble eggs, I hate cleaning up the pan and have been trying over the years many different techniques to make sure the egg's doesn't stick to the pan. (No I don't want teflon thanks). So I tried different oils, temperatures and techniques, all with the goal of getting those delici…

I use a cast iron pan for the most part.

First I put oil in the pan and let it heat up. Once it is hot, I pour the scrambled egg on it. Use my spoon, fork, whatever to distribute and turn. then I tip over the pan get the eggs onto my plate.

My pan has a nice feature to make pouring it out easier.

Usually nothing has stuck to the pan.

It is key to heat the pan and the oil first.

If something sticks, whilst still hot, pour some water on it. It will result in a satifsying bubbling that usually will get any residue out.

Dry with a (paper) towel or whatever else you use.

I usually drip a little oil in the pan before I put it away.

If that sounds complicated it realy is not. Once you do it a few times it takes up little time and is fairly reliable.

Another good tip is make sure you use the right oil. Use oil that is mean for high heat.

Re: Ask HN: Teach me something new

#394

Post by mkl »

atoav wrote: post #232

Ordering a typical printed circuit board with components placed on it is so cheap nowadays that this is a viable option for electeonic hobbyists nowadays (e.g. just ordered 50 pieces of audio output amplifiers at 3,49 € per piece (customs and shipping included), where 1.60 € would be the parts cost of the two chips on it. Only thing you need for this is: 1. An idea and some knowledge about electronics 2. An EDA softw…

What are the minimum order sizes like? Could I get two of something instead of 50, or would the per-piece price skyrocket?

Re: Ask HN: Teach me something new

#396

Post by majkinetor »

idrios wrote: post #119

In drug development, a lot of the engineering goes into making sure the pharmaceutical compound -- having been developed -- actually reaches the target area of the body. If the compound is a relatively large particle that needs to get into the blood stream, a nasal spray might result in the compound being deposited at the bottom of a person's lungs without ever getting absorbed. If stomach acids break the chemical do…

Why don't we use liposomes for all drugs ?

Re: Ask HN: Teach me something new

#397

Post by dorchadas »

Adrig wrote: post #377
wonderbore wrote: post #350

Earlier quoted context omitted.

Surely they the French could figure out that "neuf-dix-neuf" could work as well. I'm learning some South East Asian languages and the simplicity is astounding. Who needs "dix" when "dua dua" works just as well? (Indonesia)

Some French speaking countries use a more logic term for higher numbers. In Belgium and Switzerland 99 would be nonante-neuf which is ninety-nine. My uneducated guess is that at the time, it was easier to keep the base 20 to visualize a higher number. Just like we say "a few dozen eggs" to get an overall sense of the volume, it made more sense to keep it that way instead of a more arithmetic approach. Not sure why it…

> a more logic term

Logical according to whom? Why is base 10 more logical than any of the other bases? I'd argue it's not, it's simply that it's what we're used to so we think it's more logical.

Re: Ask HN: Teach me something new

#398

Post by sideshowb »

beanlog wrote: post #223
ToJans wrote: post #110

I watched a piano/music teaching video from the 60s yesterday that made it all "click" [1] Most modern music chords patterns are easy to find out on piano. Start on any of the white keys, and play 7 white keys left to right. That is called a mode: a series of notes separated by certain intervals to compose a song. Different modes have different vibes. Atmosphere of the song ( sad or happy) is directly correlated by h…

Ever since I learned that the frequency ratio between adjacent keys on a piano is always a constant twelfth root of 2 regardless of whether you're going black-white or white-white, I've been sort of frustrated with the way pianos are designed. Transposing a song to a different key could have been effortless if keys were structured differently, such as with uniformly alternating white and black keys, rather than the 2…

Pianist here. I see where you're coming from, but I definitely do also rely on the different shapes of keys to know where I am without looking. I've been learning to play the button end of an accordion and personally I find the uniformity makes it harder. But maybe that's just what I'm used to.

As an aside, I find c major a horrible key to play in, again I think the uniformity makes it harder and less ergonomic, but the same thing makes it easier to teach to beginners hence why everyone starts there.

Re: Ask HN: Teach me something new

#399

Post by 0xRusty »

nstart wrote: post #239
aspaviento wrote: post #209

Harmonicas are amazing instruments. At first people assume them to be like toys (you can buy really cheap ones everywhere) and initially the concept seems really easy: 10 holes, drawing air produces some notes and blowing air produces other notes. But the more you get into it, the more amazing it gets. Soon you discover that you can bend notes by positioning your tongue in a specific way and your repertoire increases…

Fabulous addition. For anyone looking to see what a master harmonica player looks like, highly recommend looking up blues traveller / John Popper. In particular, there’s a live performance of no woman no cry that has John Popper alongside Ziggy Marley. Mind blowing. Watch it. You won’t regret it. https://youtu.be/9zk0HFG5mDw

Check out Mark Felton playing with Oasis

https://youtu.be/CZxexZ8v-QI

Re: Ask HN: Teach me something new

#400

Post by sideshowb »

waqf wrote: post #369
beanlog wrote: post #223

Earlier quoted context omitted.

Ever since I learned that the frequency ratio between adjacent keys on a piano is always a constant twelfth root of 2 regardless of whether you're going black-white or white-white, I've been sort of frustrated with the way pianos are designed. Transposing a song to a different key could have been effortless if keys were structured differently, such as with uniformly alternating white and black keys, rather than the 2…

Transposing is effortless on most modern keyboard instruments: you press the transpose button. Now you have a choice of what key it sounds in and a choice of what fingering you find convenient. Isn't that better than your suggestion, where you're locked into one fingering?

Unless you have good pitch perception in which case transpose buttons mess you up.
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