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1/2 off haircuts (lemmy.world)
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[-] edgemaster72@lemmy.world 133 points 2 weeks ago

Teacher: See, I told you there were real world applications for limits

[-] tetris11@lemmy.ml 57 points 2 weeks ago

The real question is, to how many iterations does the hamster say "Eh, good enough"

[-] essell@lemmy.world 60 points 2 weeks ago
[-] Asetru@feddit.org 29 points 2 weeks ago

No need to be insulting. What's a guinea?

[-] essell@lemmy.world 14 points 2 weeks ago

What a high class lady like your granny used to charge

[-] vonxylofon@lemmy.world 8 points 2 weeks ago

A coin equal to 1 pound and 1 shilling.

[-] LifeInMultipleChoice@lemmy.world 7 points 2 weeks ago

Then what's a new guinea, and why does everyone talk about their father?

[-] tetris11@lemmy.ml 17 points 2 weeks ago

Yeah but it's clearly a malicious hamster giving the haircut

[-] essell@lemmy.world 5 points 2 weeks ago

Can I get that printed on a t-shirt?

[-] Schadrach@lemmy.sdf.org 2 points 2 weeks ago

Well, there's the problem! It's only half off for his protection - nobody likes hair in their cuye.

[-] marcos@lemmy.world 14 points 2 weeks ago* (last edited 2 weeks ago)

Well, "hairs" are quantized phenomenon...

So at some finite time, it will be all gone. At least if the thing is happening fast enough for it not to grow back at a similar time-frame.

[-] syklemil@discuss.tchncs.de 12 points 2 weeks ago

Kinda. At the last strand I expect them to switch to length.

But yeah, at some point should be good enough

[-] SkyeStarfall 2 points 2 weeks ago* (last edited 2 weeks ago)

But hair is still made up of discrete quantity of "stuff"

Well, eventually you get to a point where hairs grow quickly enough that the haircuts effectively stop. I think the sum total of hair material you trend towards at the limit would be the sum of length of hair that grows during the time it takes to do a haircut. Whether it's 1x or 2x of the hair growth amount depends on whether you measure at the start, or end, of the haircut

[-] PartyAt15thAndSummit@lemmy.zip 2 points 2 weeks ago

It's already about length.
The guinea pig's hair is getting cut, not ripped out.

[-] reboot6675@sopuli.xyz 48 points 2 weeks ago

When I was a kid I encountered this problem when I wondered what would happen if I half-empty a bottle of soda, re-fill it with water, and repeat. Will it eventually become just water or will there always be some soda left? It boggled my mind for a while, then I forgot about it until I reached university calculus haha

[-] ButteryMonkey@piefed.social 51 points 2 weeks ago

You invented homeopathy! Just with more steps (literally).

[-] sxan@midwest.social 24 points 2 weeks ago

You mean less steps. True homeopathy dilutes until there's no measurable amount of the substance left; it's just pure sugar/water/alcohol. You're supposedly getting benefits from "the vibrations."

Of all the pseudo-science quackery, homeopathy is one of the most idiot-prone.

[-] ButteryMonkey@piefed.social 8 points 2 weeks ago

No, I do mean more steps, because homeopathy dilutes a smaller volume of target material, they actually would perform fewer steps than dilution via halving.

[-] sxan@midwest.social 3 points 2 weeks ago

Homeopathy often dilutes by taking far less than half of a solution and diluting it in a large amount of fresh solvent. One process repeatability empties the entire container and refills it with solvent.

If you were diluting something by replacing only half with solvent, you'd have to do many more steps to get as pure solvent as homeopathy produces.

Homeopathy is a tremendously wasteful way of washing a container. It's hugely wasteful, and being a homeopathic environmentalist is oxymoronic.

[-] ButteryMonkey@piefed.social 5 points 2 weeks ago

That’s exactly what I mean.

The soda dilution by halves would have far more dilution steps to reach pure water than homeopathy.

[-] sxan@midwest.social 5 points 2 weeks ago

Ah. I read you backwards, by bad.

[-] ButteryMonkey@piefed.social 4 points 2 weeks ago

All good, language is freakin hard, man!

All that matters is we got there in the end :)

[-] jaybone@lemmy.zip 2 points 2 weeks ago

I get benefits from sugar water alcohol.

[-] Speiser0@feddit.org 2 points 2 weeks ago

What about the shaking? If you don't aCTiVate it, it won't work.

[-] ButteryMonkey@piefed.social 1 points 2 weeks ago

Hmm good call, infinite soda hack!

[-] palordrolap@fedia.io 7 points 2 weeks ago

The answer is that eventually all trace of the soda would be gone because there are only a finite number of atoms of "soda-stuff" and eventually you'll end up with a situation where there's only one molecule left, which - assuming that wasn't the water part of soda in the first place - will have a 50% chance of being in the half that's removed before the next dilution step. Theoretically it could survive infinitely many rounds of this, but the chance of that is basically zero.

How many times is that though? For a litre of soda, the lower bound is about 85. A hundred ought to be more than enough. (And 300 times would be enough to dilute the entire observable universe assuming it was soluble in water, so that's a reasonable upper bound.)

You'd almost certainly stop tasting the soda quite a while before that though. After 20 dilutions you're into parts per million soda to water.

Things become more complicated if you replace the soda in this experiment with holy water. It seems to be agreed that 50/50 holy to regular water remains holy, but after that, some believe that dilution can be repeated forever (presumably being left to sit for a while after that step) while others claim the holiness disappears once the dilution goes beyond 51%, regardless.

[-] brsrklf@jlai.lu 3 points 2 weeks ago

It's easy to test for water holiness. If you drop the bottle and it bursts into flame molotov-cocktail style, it is still holy water.

Source : Belmont et al., Wallachia, 1986

[-] racketlauncher831@lemmy.ml 2 points 2 weeks ago

"If something can happen, it will happen."

[-] TomMasz@piefed.social 25 points 2 weeks ago

Zeno tried to warn us, but did we listen? Noooooo!

[-] Klear@lemmy.world 7 points 2 weeks ago

Well, I listened to half of his argument...

[-] brown567@sh.itjust.works 23 points 2 weeks ago

Zeno's Barber

[-] 0ops@piefed.zip 22 points 2 weeks ago

Well there's a discrete number of hairs on that rodent thing, depending how the barber rounds they'll have to cut the last hair eventually. Unless they only cut half of the last hair?

[-] kamen@lemmy.world 10 points 2 weeks ago

... then they cut one half of the remaining half.

[-] nexguy@lemmy.world 7 points 2 weeks ago

Finite number of hair cells

[-] kamen@lemmy.world 9 points 2 weeks ago* (last edited 2 weeks ago)

Finite number of atoms as well, and yet scientists can split those too.

[-] FundMECFS@quokk.au 22 points 2 weeks ago

At this point you’re splitting hairs… wait…

[-] voodooattack@lemmy.world 2 points 2 weeks ago

You madlad. This is the greatest comment I’ve ever seen

[-] Jerb322@lemmy.world 3 points 2 weeks ago

I remember a comedian that had a joke similar to this. He had a volunteer come on stage, handed them a piece of paper and ask them to rip it in half. Then he told them "continue to rip it in half and eventually you'll hear a large Bang".

[-] jsomae@lemmy.ml 17 points 2 weeks ago

it took me a while to understand that the guinea pig(?) in the window is meant to be the reflection of the one outside. Because the surface is roughly parallel with the viewer, the one outside is pointing to the left, so the flipped pig should also be pointing left.

[-] Thavron@lemmy.ca 14 points 2 weeks ago

Yes the artist doesnt seem to understand reflections.

[-] Kcap@lemmy.world 7 points 2 weeks ago

"The haircut does not exist!"

[-] BandanaBug@piefed.social 4 points 2 weeks ago
[-] davidgro@lemmy.world 1 points 2 weeks ago

Only if each round of shaving, including the walking in and out, all take half as much time each round

[-] LifeInMultipleChoice@lemmy.world 2 points 2 weeks ago* (last edited 2 weeks ago)

This is one of those times you are hoping someone put Nair in the conditioner. It's rare to yearn for, but that little guy needs the help

[-] CanadianCarl@sh.itjust.works 2 points 2 weeks ago
this post was submitted on 17 Jul 2025
1043 points (100.0% liked)

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