Covert Lab Updated 2025-07-16
Moving magnet and conductor problem Updated 2025-07-16
In the above experiment:
- from the wire frame, the charge feels electromagnetic force, because it is moving and there is a magnetic field
- from the single charge frame, there is still magnetic field (positive charges are moving), but the body itself is not moving, so there is no force!
The solution to this problem is length contraction: the positive charges are length contracted and the moving electrons aren't, and therefore they are denser and therefore there is an effective charge from that frame.
This is also mentioned at David Tong www.damtp.cam.ac.uk/user/tong/em/el4.pdf (archive) "David Tong: Lectures on Electromagnetism - 5. Electromagnetism and Relativity" "5.2.1 Magnetism and Relativity".
How Special Relativity Fixed Electromagnetism by The Science Asylum (2019)
Source. Cross product Updated 2025-07-16
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. 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!
Cybercrime Updated 2025-07-16
Cyborg beetle Updated 2025-07-16
Singapore's Remote-Controlled Cyborg Insects by Vice Media (2018)
Source. By Dr. Hirotaka Sato from Nanyang Technological University Singapore.
There are unlisted articles, also show them or only show them.