So it's kind of cool that a theoretical biometric could be stable over time and not easily leaked, that could take time to produce. Like some sort of cold storage biometric in the far future once certain biometrics become less useful after they're too easily lifted and replicated with new technology. Sort of like deprecating obsolete cryptographic protocols once they're too easily broken.
obsolete cryptographic protocols are many times used as a fallback. some application gets response from malicious actor about not supporting such new crypto, so server falls back to older cipher.. lets say some 100s billion dollar companies use systems which behave like this still in 2025...
“A student asked, ‘Yeah, but do the wrinkles always form in the same way?’ And I thought: I haven’t the foggiest clue!” said German, a faculty member at the Thomas J. Watson College of Engineering and Applied Science’s Department of Biomedical Engineering. “So it led to this research to find out.”
If I don't, then it's mighty strange that I've been binging Groucho Marx interviewing random people from the audience in the 1950s show You Bet Your Life for the past few hours, and his fascinating interviews with Dick Cavette and William Buckley Jr.
Anyway yeah that's literally the main reason any of us are on HN. Besides procrastinating.
[^0]: https://www.livescience.com/47421-human-brain-wrinkles.html
[^1]: https://medium.com/@nico727272/drawing-hilbert-curves-using-...
also most shampoos, shower gels are just soap making ingredients + fragrance + color...
not walking on direct sun most of the day did more to beauty of current population than any beauty product on planet. yes im ugly.
Might I point out that combing and brushing are definitely affected by shampoo and conditioners?
Source: although I am bald now, I had up to a meter of hair at various points in my life.
Twisted Sister?
In total, or in parallel?
Actual soap, with a basic pH, makes hair very difficult to comb.
Yeah, i meant as a not changing structure of hair. Open women magazine and read what adverts say their heavenly concoction allegedly does to your hair. It does not do that.
I don't know the scope of "nothing" in your statement, but shampoo does help remove dirt and oil, in a way that washing with water only cannot achieve, which is the number one goal of using shampoo for most people.
This is verifiable by observing and touching hair of other people's hair before and after shower, which eliminates the possibility of shampoo manufacturers secretly altering what you perceive with your fingers.
No; you would need to touch people hair after a shampoo shower and after a non shampoo shower to see the difference.
My very possibly wrong understanding is that plain water + the mechanical action of the water being sprayed on the hair + your hand scratching the scalp does a huge portion of the work. Shampoo itself does very little. So if you don’t have any at your disposal; just does “as if”; and for slightly longer and you will essentially be good to go.
Yes, that's exactly what I mean. My girl friend has long hair, and doesn't wash with shampoo every day (which is somewhat common for long-haired people I believe), and the texture after shower is very different.
In college, especially exam week, we had more anecdata. It was possible to see people who 1) had not washed their hair, 2) had washed their hair in a sink with water only, 3) dry-washed with those sprays, and 4) washed with shampoo. It was very easy to tell which they did.
In general, soapy cleaner (or similar substances) is going to help immensely when cleaning oily stuff. And hair can be really oily. Water-only is just not the same.
One scenario I don't have is comparing other soapy products to shampoo. But shampoo aren't more expensive than other soaps anyway, so I never bothered to look.
There are two types of people who don't shampoo every day: those who don't wash their hair every day, and those who wash their hair with water most days but shampoo only some days.
If your girlfriend is in group 2, then your experience is relevant to the parent's post; if she is in group 1, then you haven't yet experienced the difference.
Washing with soap removes oils. This is a pretty obvious effect from anyone who's ever tried to clean up oil/grease with soap (ex: dawn).
Rinsing with just hot water distributes oils from the scalp down towards the ends and it removes a little bit of oil in the process.
Rinsing with cooler water is less effective at distributing oils but also loses less oil in the process.
Not washing allows grease/oils (and skin/dander) to build up on the scalp and saturate hair near the scalp.
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If you are just rinsing/scrubbing with water, it does a lot relative to not washing at all but there isn't really a comparison when it comes to soap's efficacy at stripping oils/making them semi-water soluble so they can be washed away.
One example - I did ie yesterday shower at gym after workout, after sauna, but didnt have shampoo so just water, cold and warm. Then washed just my hair at home. Hair and skin without any oil in gym, but very different feeling and also behavior of hair when combing. Shampoo makes hair much smoother for example, also less tough / more bendy.
Huh? It removes oil and dirt.
If I go for a couple days without washing my hair it gets greasy and gross. Water by itself doesn't remove oil buildup.
And yes of course it's like soap. But it's milder. Technically it's a detergent because soap is too harsh.
I've never heard anyone say shampoo is a scam, this is definitely a first...
Well it's not a scam, it's a sham. Don't settle for fakes, demand real poo! :)=
The wrinkly formation lets water drain better (like treads of a tire).
do you really have better gripe with wrinkled fingers underwater?
But how long is too long? Prolonged immersion can lead to skin damage or dehydration, and the risk depends on water temperature and the individual’s condition. It’s fascinating how much our bodies can adapt, but it also reminds me how important it is to listen to our bodies and not push limits.
Does each body have a different tolerance to water immersion? Can we train our bodies to withstand longer periods, or is there a limit to what our skin can handle?
Interesting idea though. Tracking biometrics through slow reproducible processes.
gerdesj•8mo ago
If this is new then CSI will probably have a new tool. I suggest investigating other areas of the body to see if the same holds.
Do we have toe prints? ... and does the wrinkling thing hold for toes?
lab14•8mo ago
ggm•8mo ago
RajT88•8mo ago
themaninthedark•8mo ago
They don't, cue Immigration officials being frustrated with seniors who are debarking after an international flight with a queue forming behind them....
https://www.ifsecglobal.com/access-control/why-age-is-not-ju...
_DeadFred_•8mo ago
https://pubmed.ncbi.nlm.nih.gov/32990979/
AngryData•8mo ago
Its like matching the make of a vehicle and their tire tracks. Yeah if you have someone you suspect, and you see he has the same tires and model of car as was reported, it likely is useful. But if you just try to blame the first person you find with the same model vehicle and the same tires despite the lack of other evidence, you are inevitably going to screw over some random innocent person. Fingerprints are less unique than someones face, and plenty of people have been thrown in jail because they merely looked like a suspect.