this post was submitted on 26 Sep 2024
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https://en.wikipedia.org/wiki/Demodex
My fave parts (edited for brevity):
... and ...
Ohhh good.
Wait, 0.3mm is huge, you should be able to see that. I don't think this is right.
Maybe we do see them, but mistake them for bits of skin or dirt.
0.3mm in length, not diameter. Yes, you can see them, but they just look like dead skin/gunk to our eyes.
Image1
Image2
Image3
Gallery with visible accumulation of mites on hairs
Agreed. 1/64th of an inch is .016". An average human hair is .003" in diameter, that would be as long as five hairs wide. You wouldn't even need a magnifier to see the largest ones.
Combine the size with the fact that they are semi transparent and live in hair follicles and sebaceous glands, both of which are essentially under the skin, and that's why you don't generally see them.
Who uses inches at this scale? I mean, really, Wikipedia.
"Hand me my 1/256th inch ruler."
I learned recently that machinists used to use fractions to indicate tolerance, like a dimension given as 5/16 could be ±1/32 of an inch, because anything less than 9/32 would round to 4/16, and anything more than 11/32 to 6/16.
It can still happen, but usually at the customer's request/requirements. We actually use inches at a much smaller scale, but use decimals instead of fractions.
Fitting username :P
Although tbh they look kinda cute!