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Chemical Formulas

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Can you pass the nackle?
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alt_text_bot
31 minutes ago
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Can you pass the nackle?
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Human Altitude

1 Comment and 4 Shares
I wonder what surviving human held the record before balloons (excluding edge cases like jumping gaps on a mountain bridge). Probably it was someone falling from a cliff into snow or water, but maybe it involved something weird like a gunpowder explosion or volcano.
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alt_text_bot
3 days ago
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I wonder what surviving human held the record before balloons (excluding edge cases like jumping gaps on a mountain bridge). Probably it was someone falling from a cliff into snow or water, but maybe it involved something weird like a gunpowder explosion or volcano.
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Uncanceled Units

4 Comments
Speed limit c arcminutes^2 per steradian
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alt_text_bot
5 days ago
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Speed limit c arcminutes^2 per steradian
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3 public comments
gordol
5 days ago
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How many furlongs per fortnight?
Earth
fancycwabs
5 days ago
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I am reminded of this video about cursed units: https://www.youtube.com/watch?v=kkfIXUjkYqE
Nashville, Tennessee
marcrichter
5 days ago
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OK I just HAD TO compare it against EU efficiency classes - large American-style fridges using 0.70 kWh/day are efficiency class C, apparently. 👀
tbd

Radon

2 Comments and 5 Shares
A good ²³⁸Umbrella policy should cover it.
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alt_text_bot
7 days ago
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A good ²³⁸Umbrella policy should cover it.
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1 public comment
jlvanderzwan
6 days ago
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Ackchyually, IIRC without radioactive decay our planet would have cooled down below life-sustaining temperatures long before any complex life-forms would have had the chance to evolve

https://en.wikipedia.org/wiki/Earth%27s_internal_heat_budget#Heat_and_early_estimate_of_Earth's_age

The part where it took 800 million years of before life evolved something to do with all that toxic oxygen that those damn cyanobacteria were producing was a particularly difficult hurdle.

https://web.archive.org/web/20130124200735/https://www.patheos.com/blogs/daylightatheism/2009/02/bands-of-iron/

Funny how that one never pops up in discussions of "great filters" - the Sun is 4.6 billion years, will burn out in another 5. Life spent almost 10% of that time repeatedly almost killing itself before some life form figured out how to use oxygen. What if that's the part where we got lucky, and that on average most habitable planets get stuck in this self-destructive oxygen cycle?

https://en.wikipedia.org/wiki/Great_Filter
matthiasgoergens
6 days ago
The sun heats the earth. Yes, the core would have cooled down faster without radioactive decay. But it's not clear how that would affect surface temperatures or what effect that would have on life on earth.
jlvanderzwan
5 days ago
It's true that the sun heats *the surface* of the earth and completely dominates the energy input there. However, we capture that heat due to having an atmosphere. Part of what maintains the atmosphere (over millions of years) is volcanic activity. Volcanic activity exists due to having a molten core. Also, life seems to have started at geothermal vents. So alltogether life would be radically different at the very least, and likely way more limited in its opportunities to evolve.

Chess Zoo

3 Comments
The zoo takes special care to keep kings separated from opposite-color pieces as part of their conservation program to prevent mating in captivity.
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alt_text_bot
10 days ago
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The zoo takes special care to keep kings separated from opposite-color pieces as part of their conservation program to prevent mating in captivity.
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2 public comments
deebee
9 days ago
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Never felt the need to print an XKCD until now
America City, America
macr0t0r
10 days ago
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Somehow, this makes bishops appear the most peaceful as they comingle. But the pawns: put those vicious monsters in the farthest corner inside a double-walled enclosure. They eat everything!

Trimix

1 Comment and 2 Shares
You don't want the nitrogen percentage to be too high or you run the risk of eutrophication.
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alt_text_bot
11 days ago
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You don't want the nitrogen percentage to be too high or you run the risk of eutrophication.
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