Also why you don't re-use needles:
this post was submitted on 09 Aug 2025
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That's not the main reason why we don't reuse needles.
One of the many
For even into the same patient…
Pfft I reckon we can reuse it once from that pic
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(9 replies)
It's a little misleading in that the last photo is zoomed in a lot more than the previous ones. This one has that without the extra zoom in.
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(8 replies)
Wow, I did not expect that.
Can we see the skin after that sixth use?
To shreds, you say.
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(2 replies)
how do we know this isn't just a closeup of a tardigrade butthole?
They're well studied.
https://www.livescience.com/62602-tardigrade-poop-video.html
TIL
This deserves its own post.
Also doesn't deserve Twitter, now known as a letter owned by a Gestapo enthusiast.
I bet that feels amazing.
Here's a photo of the tardigrade in action:
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(4 replies)
There was missing something...
Hard to believe. To prepare a sample for an electron microscope you need to freeze it to nitrogen temperatures or below. You can fix it using glutaraldehyde, but again, you need to cut it accurately immediately after the penetration. My bet is that either stabbed dead skin or some sort of graphics.
Yes! When I did electron microscopy, we had to cover the fix the samples and cover them with a very thin gold layer beforehand.
Yeah, and it's impossible to catch color!
In rationalist hell there is a special teapot for people who color SEM images
Thanks, I hate it. Not because of the hole, but because of how unhealthy the skin looks in this picture.
Were you expecting it to be smooth like plastic? The top layer is basically a bunch of dead skin cells that keep flaking away from the top layer and building up again from the lower layers.
Not if you moisturize
^/s,^ ^of^ ^course,^ ^though^ ^I’m^ ^sure^ ^you^ ^could^ ^put^ ^this^ ^photo^ ^on^ ^Instagram^ ^and^ ^be^ ^like^ ^“this^ ^is^ ^your^ ^skin^ ^without^ ^my^ ^brand^ ^of^ ^healing^ ^lotion^ ^made^ ^of^ ^baby^ ^foreskin”^ ^and^ ^make^ ^plenty^ ^of^ ^sales^
dehydrate dehydrate dehydrate...
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(3 replies)
Scanning electron microscopes image in a vacuum. Nothing looks 100% like it does at sea level when you suck all the air out.
Pik pik pik
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(1 replies)
That old familiar sting.
Most SEMs use a vacuum chamber to get their photos. Also, it's not uncommon to sputter a conductive coating onto the surface you're scanning.
How the hell did they get this photo?
Environmental SEMs do not require vacuum and can be used for nonconductive samples. The beam ionizes the air which prevents the sample from charging. Magnification is limited but it is more than enough for this.
You can tell it is SEM and not optical by the depth of field. An optical image at this magnification would have much less DoF so the peaks/valleys would be blurry.
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(1 replies)
Put a needle in someone, freeze them solid with liquid nitrogen, then take a picture. Throw body out with rest of specimens.
Easy peasy.
It likely wasn't done on an electron microscope, or at least there is no reason to. There is no scale bar, but quick look online tells me a very fine needle is about 0.016in. 500x magnification optical lens would give you more than enough resolution for a photo like that.
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(3 replies)
no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no no
Yes ( ͡° ͜ʖ ͡°)
The pores on my face as seen by the naked eye.
Everything reminds me of her
I should also call your mom.
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