this post was submitted on 15 Nov 2024
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Science Memes

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[Thread] Mental Math (mander.xyz)
submitted 8 hours ago by [email protected] to c/[email protected]
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[–] [email protected] 59 points 8 hours ago (11 children)

When sharpening knives, with practice you can tell when you are done by sliding your fingertips along (not across) the sharpened bevel. It's possible to feel imperfections measured in micrometers this way.

[–] [email protected] 1 points 3 hours ago (1 children)

Source??

[–] [email protected] 8 points 2 hours ago

my half a finger

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