Reproductive cue Updated +Created
A signal that indicates that an animal is ready for mating.
Fizeau experiment Updated +Created
Water Margin scene Updated +Created
GNU parallel Updated +Created
The author Ole Tange answers every question about it on Stack Exchange. What a legend!
This program makes you respect GNU make a bit more. Good old make with -j can not only parallelize, but also take in account a dependency graph.
Some examples under:
man parallel_exampes
To get the input argument explicitly job number use the magic string {}, e.g.:
printf 'a\nb\nc\n' | parallel echo '{}'
sample output:
a
b
c
To get the job number use {#} as in:
printf 'a\nb\nc\n' | parallel echo '{} {#}'
sample output:
a 1
b 2
c 3
c 3
{%} contains which thread the job running in, e.g. if we limit it to 2 threads with -j2:
printf 'a\nb\nc\nd\n' | parallel -j2 echo '{} {#} {%}'
sample output:
a 1 1
b 2 1
c 3 2
d 4 1
The percent must be a reference to "split the inputs module the number of workers", and modulo uses the % symbol in many programming languages such as C.
To pass multiple CLI arguments per command you can use -X e.g.:
printf 'a\nb\nc\nd\n' | parallel -j2 -X echo '{} {#} {%}'
sample output:
a b 1 1
c d 2 2
Hafele-Keating experiment Updated +Created
Nabla symbol Updated +Created
Nabla is one of those: it was completely made up in modern times, and just happens to look like an inverted upper case delta to make things even more confusing!
Nabla means "harp" in Greek, which looks like the symbol.
Positive definite symmetric bilinear form Updated +Created
Sine Updated +Created
Sulfur hydrade Updated +Created
Video 1.
Danger by Bayway Refinery
. Source. TODO year.
Sycee Updated +Created
TODO freely licensed image of sycees presented on a plate. This is how gifts/prizes would be formally handed in ancient China, possibly wrapped in silk to make it more discrete.
American academic journal Updated +Created
American learned society Updated +Created
American newspaper Updated +Created
American Physical Society Updated +Created
Complex coordinate space of dimension 2 Updated +Created
Journey to the West adaptation Updated +Created
Origins of Precision by Machine Thinking (2017) Updated +Created
Great overview of the earlier history of unit standardization.
Gives particular emphasis to the invention of gauge blocks.
Analog electronics Updated +Created
Famous conjecture Updated +Created
This section groups conjectures that are famous, solved or unsolved.
They are usually conjectures that have a strong intuitive reasoning, but took a very long time to prove, despite great efforts.

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