How can a single ear drume in you ear hear multiple frequencies at the same time?

Sound is a pressure in air and when the pressure waves from multiple sources interact you get the sum of all those waves. So the pressure wave that reaches your ear is a combination of all sound sources and results in a single pressure on your eardrum at each moment in time. Over time the eardrum move following the combined pressure of all the sound waves.

If a force a speaker membrane to move just like your eardrum did it will produce a pressure wave just like the one that reached your ear and you will hear the same sound.

Mathematically you can show that any periodical movment that is just not a single sine wave can be described as the sum of multiple sine waves. So unless it will perfectly move as just a single sine wave it will produce multiple frequencies. You can show the same thing for no period signals but then you can never have a single frequency, if you did it would be a periodic sine wave.

A speaker doesn't "know" frequencies. It is a device designed to create a pressure wave in the air that we interpret as sound. So it moves according to the signal given.

The signal itself is a single wave that consists of a combination of waves of different frequencies.

That's it.

For a non ELI5 explanation, this would require some knowledge of waves and possibly Fourier transforms etc.

Simple soundwaves (sinewaves) of various frequencies add up to a single complex waveform. A single guitar note, for example, is a complex.waveform made up of various simple waves of different frecuencies. This is the Fourier theorem.

So a speaker reproduces a single waveform, which is the sum of all the frequencies of whatever it is playing.

Sounds are vibrations in air, which can be thought of as waves of varying pressure. Air can only be one pressure at a given time and place, which means that multiple sound frequencies merge together through something called "interference". There can be destructive interference where a peak of a wave encounters the trough of another and cancel each other out to some extent, or constructive interference where two peaks or two troughs encounter each other and combine to form a higher peak or deeper trough.

Multiple sound frequencies then all combine to form one complex sound wave which a speaker can then produce.

Babies smile, laugh and cry without being taught. It seems likely that these reactions are inborn and universal.

The fact that you have a friend of X race does not fully tell how you treat other people from his race.
As a better example, a man can love and respect his mother r. However he can have a misogynist behaviour towards all other woman around him. He cannot justify that he is not a misogynist just because he treats his mother with respect.
Also, “friendship “ can have many meanings, levels or reasons. An office friend is not the same as a life long friend in general. You can be a friend of a single person of X race for a specific reason, or even just because you got used to his presence. But it might not be a “full” friendship from your heart. He could be more like a colleague for example. Or you think you are his friend because you treat him nice and help him, but you could be seeing him with a sense of superiority (you think you are better than him, so try to help him with some pity), and this could be because of race.
It could be even unconscious.

I might not be explaining much. But hope i give you some examples of why having a friend from X race is not a logical proof to say you are not racist.

Racism is treating someone differently because of their race

If you have a friend of a specific race but still treat the rest of that race, differently, judgmentally or with prejudice still makes you a racist

Edit: Whoops, didn't realize this was in ELI5.

ELI5: Sometimes you lump people together by some common things that they share. You may think good or bad things about this group that changes how you treat them. Whether or not you're wrong, or even if you don't mean to, you may treat them this way anyway. That's okay - you're not perfect, and your friends aren't perfect, but you're still friends anyway.

Original:

To preface, I'm a 2nd generation Chinese American.

1. As u/mugenhunt mentioned, the "one of the good ones" mentality, based on profession, education, birthplace, mixture, etc. Heard someone say, "I have friends who are African American. But that one there, that's a N-", just based on how they dressed. My 1st generation Chinese parents also get treated differently than I do. I've had overtly racist friends; sometimes their positive qualities outweigh their blatant racism - enough to keep them around in some contexts, at least.

2. Subconscious racism/microaggressions. Among the people I've dated, I've noticed minor assumptions or actions based on my race. A little negative, but nothing intentional. Even from the anti-racism activist. Still loved them all the same.

Me: "Here, try this steamed bun." Them: "Huh, how does the rice flour rise like this?" Me: "It's wheat flour. North China is wheat-based, South China is rice-based."

3. Self racism. Sometimes we make racist comments amongst ourselves - we give ourselves a "free pass", but they're still harmful. Even I subconsciously get more concerned when an Asian coughs on a bus than when Caucasians do.

Friendship is a spectrum. Racism is a spectrum. They're correlated, but not mutually exclusive.

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There's many racist people who will justify being kind to some members of that minority group, saying "they're one of the good ones" while still holding prejudiced views against the group as a whole.

Can you rephrase this question?

Just because you are friends with someone of a certain race doesn’t mean you can have a free pass to also be racist towards that group

> Excessive cold (below freezing) or heat (above 100 degrees) both cause the glass to weaken over time

Glass is much more enduring than you think

That's fine. I'm not arguing its efficacy as a treatment. You said "Get your medical advice from your doctor and stop taking it from random people on Reddit" and I'm just pointing out that many doctors do advise honey and lemon as a treatment for cold symptoms.

Ya but that stuff will eat away at snakes. Not to mention that it still splashes and can get on you fairly easily

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Today you enter the club

Honey and lemon is a popular home remedy for cold-like symptoms because the honey acts as a natural cough suppressant and the lemon contains vitamin C, which can help boost the immune system and potentially alleviate some cold symptoms. Lemon may be more effective than other citrus fruits like oranges or limes because it has a higher concentration of vitamin C.

Not a plumber but have done some basic construction work on sites and in houses. A lot of modern plumbing uses PVC pipe or some plastic equivalent. Pouring boiling water into a drain that's clogged shut can trap that water and transfer the heat to the pipe leading it to deform or the joints to come loose.

What I would personally be more worried about is if it's a slower leak. Your drainage pipes have lots of fat and such in them. The hot water will melt or dislodge chunks of it that will reform into a larger problem farther down the pipe.

Well, I do have an enzyme cleaner that I have been told works well as pm on a problematic section of pipe I have. All I know for certain is that bit keeps alligators away.

Just in case you don't know, sucrose is sugar, which would make roughly 37% of that thing, which looks like cough syrup.

What nobody is telling you is its water content (medicine doesn't tipically show dry content data) for people like you who doesn't know it and also doesn't understand that ingredients are listed in amount order.

>initial strong claim that it doesn't do anything

I did not make this claim. I said there was no significant evidence that it does anything.

>I can actually find reputed sources (top tier universities) saying that it does.

I strongly recommend you have this conversation with your doctor.

>Unlike you, I do have a good science education and I like to learn.

Awful bold of you to assume you know anything whatsoever about my background, education, or professional experience.

>You are either just dumb

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Sodium Hydroxide gives off a lot of heat when dissolved in water. By giving it a head start with pre-boiled water you risk it splattering and that stuff does not like human skin, eyes and mucous membranes.

I would be careful with that. My doc is conviced I've given myself some bad heartburn due to drinking lemon juice diluted with water everyday. Can't imagine what drinking pure lemon juice a lot would do

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