Cryptocurrency Updated 2025-07-16
Cryptocurrency mining Updated 2025-07-16
Cryptocurrency tumbler Updated 2025-07-16
Crystallography Updated 2025-07-16
Crystal oscillator Updated 2025-07-16
From Raw Crystal to Crystal oscillator
. Source. by United States Army Signal Corps (1943) Multicellularity is polyphyletic Updated 2025-07-16
From Wikipedia:and:
Multicellularity has evolved independently at least 25 times in eukaryotes
Complex multicellular organisms evolved only in six eukaryotic groups: animals, symbiomycotan fungi, brown algae, red algae, green algae, and land plants.
CSV CLI tool Updated 2025-07-16
The generic tool recommendation question: unix.stackexchange.com/questions/7425/is-there-a-robust-command-line-tool-for-processing-csv-files
csvgrep from csvkit Updated 2025-07-16
Simple example:output:
printf '00,11,22\n33,44,55\n' | csvgrep -H -c2 -r '^11$' | tail -n+200,11,22 csvkit Updated 2025-07-16
Lots of features, but slow because written in Python. A faster version may be csvtools. Also some annoyances like obtuse header handing and missing features like grep + cut in one go: csvgrep and select column in csvkit.
csvtools Updated 2025-07-16
Build failed with
undefined reference to pcre_config on Ubuntu 23.04: github.com/DavyLandman/csvtools/issues/18Unfortunately it is lacking some basic options, like optional header + selecting column by index on
csvgrep (though csvcut has it). The project seems kind of dead.Also unclear if it allows to filter + print only selected columns.
Cuisine Updated 2025-07-16
Cultured food Updated 2025-07-16
- 2024 www.uktech.news/foodtech/alternative-meat-research-centre-20240829A research centre examining the implementation of alternatives to meat, backed by £38m, will be launched by the University of Leeds.
- 2024 techcrunch.com/2024/08/04/even-after-1-6b-in-vc-money-the-lab-grown-meat-industry-is-facing-massive-issues/ "Even after $1.6B in VC money, the lab-grown meat industry is facing 'massive' issues"
- www.reuters.com/markets/commodities/hoxton-farms-raises-22-million-cultivated-animal-fat-2022-10-20/ Hoxton Farms, cultured animal fat
Cultured meat Updated 2025-07-16
Curie temperature Updated 2025-07-16
Variation of saturation magnetisation with temperature for Nickel
. Source. This graph shows what happens when you approach the Curie temperature from below. BrainSimII Updated 2025-07-16
CuriousMarc Updated 2025-07-16
Has been going wild with restoration and reverse engineering of the Apollo moon mission.
Inside the WILD Lab of CuriousMarc by Keysight Labs (2022)
Source. - youtu.be/qwocVH3_1Eo?t=841 the IBM System/360 is insane!
yolov5-pip Updated 2025-07-16
OK, now we're talking, two liner and you get a window showing bounding box object detection from your webcam feed!The accuracy is crap for anything but people. But still. Well done. Tested on Ubuntu 22.10, P51.
python -m pip install -U yolov5==7.0.9
yolov5 detect --source 0 What happens to the definition of the orthogonal group if we choose other types of symmetric bilinear forms Updated 2025-07-16
We looking at the definition the orthogonal group is the group of all matrices that preserve the dot product, we notice that the dot product is one example of positive definite symmetric bilinear form, which in turn can also be represented by a matrix as shown at: Section "Matrix representation of a symmetric bilinear form".
By looking at this more general point of view, we could ask ourselves what happens to the group if instead of the dot product we took a more general bilinear form, e.g.:The answers to those questions are given by the Sylvester's law of inertia at Section "All indefinite orthogonal groups of matrices of equal metric signature are isomorphic".
- : another positive definite symmetric bilinear form such as ?
- what if we drop the positive definite requirement, e.g. ?
What poor countries have to do to get richer Updated 2025-07-16
Like all poor countries, Brazil's lack of money and scientific culture severely limit its ability to make technological and scientific advances.
While this sounds obvious, Ciro Santilli has felt it first hand since he moved from Brazil to Europe, and it is just shocking.
WhatsApp Updated 2025-07-16
Claimed to remove metadata from servers unless legally obliged to collect it: www.quora.com/Does-WhatsApp-store-messages-on-its-servers-or-is-all-deleted-after-delivery-and-only-stored-on-recipients-phones/answer/Ciro-Santilli
They claim to delete metadata: www.quora.com/Does-WhatsApp-store-messages-on-its-servers-or-is-all-deleted-after-delivery-and-only-stored-on-recipients-phones/answer/Ciro-Santilli
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