" keyword " |
Finds the string within quotes, including spaces.
Case-insensitive.
(Escape quotes inside with \") |
"Hackers' Pub" |
from: handle |
Finds content written by the specified user. |
from:hongminhee
from:hongminhee@hollo.social |
lang: ISO 639-1 |
Finds content written in the specified language. |
lang:en |
# tag |
Finds content with the specified tag.
Case-insensitive. |
#HackersPub |
condition condition |
Finds content that satisfies both conditions on either side of the space (logical AND). |
"Hackers' Pub" lang:en |
condition OR condition |
Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR). |
#HackersPub OR "Hackers' Pub" lang:en |
( condition ) |
Combines the operators within the parentheses first. |
(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en |
![History
Robert Wilhelm Bunsen coined the name kakodyl (later modified to cacodyl in English) for the dimethylarsinyl radical, (CH3)2As, from the Greek κακώδης kakōdēs ("evil-smelling") and ὕλη hylē ("matter").
It was investigated by Edward Frankland and (for over six years) by Robert Bunsen and is considered the earliest organometallic compound discovered (even though arsenic is not a true metal). Bunsen began studying it in the 1830s and had determined its chemical composition by 1843; during this time Bunsen discovered cacodyl's flammability and extreme unpleasant odor.[3] As this was prior to the invention of the fume hood, to avoid the unpleasant odor of the chemical Bunsen worked quickly and breathed through a long glass tube that extended to the outside of his laboratory. Despite these precautions, Bunsen learned the hard way just how dangerous and toxic cacodyl could be: he nearly died of arsenic poisoning and lost sight in one of his eyes after a glass vial of cacodyl exploded in close proximity to his face.
From cacodyl, other compounds were made, such as cacodyl fluoride, cacodyl chloride, et cetera. One compound, cacodyl cyanide, was particularly dangerous. In Bunsen's words "the smell of this body produces instantaneous tingling of the hands and feet, and even giddiness and insensibility...It is remarkable that when one is exposed to the smell of these compounds the tongue becomes covered with a black coating, even when no further evil effects are noticeable".](https://files.mastodon.social/media_attachments/files/114/598/225/806/720/867/original/20e3fe6f2083e8c6.png)