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] 47 points 7 hours ago (4 children)

If the earth were shrank down to the size of a golf ball, you could feel houses.

[–] [email protected] 89 points 7 hours ago (3 children)

That seems wildly unnecessary. I can already feel houses.

[–] [email protected] 1 points 5 hours ago (2 children)

I'm sure there's some actual science thing they're referencing here, but I don't understand it. Who can't feel houses?

[–] [email protected] 5 points 4 hours ago

Both a house and a golf ball are unbelievably tiny compared to the size of the Earth. The idea that you can shrink the Earth many thousands of times over and be able to feel a house parallels with our ability to feel micro imperfections on knife blades.

[–] [email protected] 7 points 5 hours ago

People without fingers, I guess

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