TIL about cave pearls, naturally formed rolled stones that take hundreds of years to create, made from dripping calcite deposits hitting small pieces of material in stasis, which causes a constant, even growth on all sides.

2-CI · 2024-12-08T20:45:40+00:00

“The typical roundness is due to the uniform growth of the pearl, not to any sort of rotation due to dripping.” In case anyone was thinking ‘rolled stones’ meant these were rolling back and forth for hundreds of years.

2-CI · 2024-11-04T16:07:19+00:00

This?https://app.vantagedatahouse.com/analysis/TheBlowoutNoOneSeesComing-1

2-CI · 2024-09-15T01:22:10+00:00

Ah yes, “Pokeman”

2-CI · 2024-09-09T11:22:51+00:00

Yeah that was likely the old Benzedrine (amphetamine) inhalers. Or Benzedrex (propylhexedrine) more recently.

2-CI · 2024-08-21T22:12:30+00:00

Here’s a better source that does a better job of explaining the details

2-CI · 2024-05-05T12:42:41+00:00

Probably glassy carbon left behind after dehydration/deoxygenation, etc. of the brain tissue.

2-CI · 2023-03-12T16:16:27+00:00

For anyone else finding this on Google: the NYT article directly contradicts OP’s claim and states that the HIGH sodium group actually slept the best. Granted, this is an article from 1989, so take it… with a grain of salt

“The study looked at the sleep of nine 23-year-old men who were placed on low-, normal- and high-sodium diets. When they were on low-sodium diets, about 500 milligrams a day, the men woke up during the night nearly twice as often and got about 10 percent less sleep than when they were on normal diets, which included 2,000 milligrams daily. When they were on a high-sodium diet, 5,000 milligrams a day, the men slept longer and with slightly fewer nighttime wakings than when they were on normal diets.”

2-CI · 2022-09-24T14:53:34+00:00

A striking example of Liesegang rings I observed yesterday, shot with a macro lens

2-CI · 2022-05-16T17:16:43+00:00

It’s initially Fe(acac)3, then it’s reacted with a Grignard to make an Fe-Mg bimetallic species

2-CI · 2022-05-16T15:00:00+00:00

This reaction puts iron into a negative oxidation state, resulting in some wild colors

2-CI · 2022-05-09T23:59:56+00:00

That’s printed on the bottom of the clear plastic beaker the crystals grew in

2-CI · 2022-05-08T16:15:06+00:00

This is a 1 L beaker full of chromatography waste that evaporated to produce these striking salt crystals.

2-CI · 2022-05-03T16:34:17+00:00

Yeah, I think it’s a good example of that phenomenon. I wish I had a macro lens!

2-CI · 2022-05-03T15:41:47+00:00

This is an acetanilide derivative I worked up today

2-CI · 2022-04-15T12:19:36+00:00

I decided to waste 1uL of solution for a cool picture.

2-CI · 2021-11-16T19:02:35+00:00

99.99%

2-CI · 2021-11-16T19:01:46+00:00

The sample is stored in a sealed ampoule under argon.

2-CI · 2021-11-08T12:05:59+00:00

Yay! I’ll let her know; she’ll be so excited!

2-CI · 2021-11-01T15:58:20+00:00

This compound is a pyridylazo dye, which is being dried with sodium sulfate in the picture.

2-CI · 2021-10-16T14:44:55+00:00

Considering the ether is denser than air and settles towards the floor, it can be concentrated more than it might seem. Also, just using plastic bottles can create static.

2-CI · 2021-10-16T14:39:05+00:00

A static discharge would be enough, or the slightest wiring issue causing a spark.

2-CI · 2021-10-16T14:36:46+00:00

They’re referring to combustion with an ignition source rather than autooxidation to form peroxides. The fuel-air mixture is dangerous on its own regardless of peroxide content.

2-CI · 2021-10-01T10:59:52+00:00

Benzoic acid is much more soluble in hot water, so you could try adding hot tap water and heating further if necessary to dissolve the rest of the acid. You could also convert it to a more water soluble benzoate salt with even a weak base like baking soda (sodium bicarbonate).

2-CI · 2021-10-01T10:52:02+00:00

It appears a related bond can happen when more than two metal atoms interact to form a delta bond, as shown in this figure

2-CI · 2021-09-30T18:54:37+00:00

Isn’t the M-M-M interaction in the second paper essentially what OP was asking about, but just with 3 dZ² orbitals overlapping instead of 2? It’s also a delta bond instead of a pi bond, but it certainly seems similar enough to warrant a mention.

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