Capacitor Updated 2025-07-16
The fundamental intuition about capacitors is that they never let electrons through.
They can only absorb electrons up to a certain point, but then the pushback becomes too strong, and current stops.
Therefore, they cannot conduct direct current long term.
For alternating current however, things are different, because in alternating current, electrons are just jiggling back and forward a little bit around a center point. So you can send alternating current power across a capacitor.
The key equation that relates Voltage to electric current in the capacitor is:
So if a voltage Heavyside step function is applied what happens is:
  • the capacitor fills up instantly with an infinite current
  • the current then stops instantly
More realistically, one may consider the behavior or the series RC circuit to see what happens without infinities when a capacitor is involved as in the step response of the series RC circuit.
Video 1.
Finding capacitance with an oscilloscope by Jacob Watts (2020)
Source. Good experiment.
Car Updated 2025-07-16
Carbon Updated 2025-07-16
Carbon-13 Updated 2025-07-16
Cardano Updated 2025-07-16
This was getting very hot as of 2022 for some reason. Would be good to understand why besides the awesome name.
Cardinality Updated 2025-07-16
The size of a set.
For finite sizes, the definition is simple, and the intuitive name "size" matches well.
But for infinity, things are messier, e.g. the size of the real numbers is strictly larger than the size of the integers as shown by Cantor's diagonal argument, which is kind of what justifies a fancier word "cardinality" to distinguish it from the more normal word "size".
The key idea is to compare set sizes with bijections.
Carl Sagan Updated 2025-07-16
Carl Zeiss AG Updated 2025-07-16
Video 1.
Carl Zeiss, Explained by Asianometry (2021)
Source.
Video 2.
How Carl Zeiss Crafts Optics for a $150 Million EUV Machine
. Source. Difficulty: light at those frequencies get absorbed by lenses. So you have to use mirrors instead.
Caroline Ellison Updated 2025-07-16
Some analysts seem to suggest that the things she said were bad.
But they're not.
They're a rare example of someone with some power saying cool honest stuff that comes across their mind.
Unlike the endless mandatory corporate bullshit we usually get otherwise.
Carrier wave Updated 2025-07-16
Early transmitters such as the spark-gap transmitter could only send noises to send Morse code.
To send voice and music, amplitude modulation had to be developed. And a key ingredient of this is the carrier wave.
The problem is, the carrier wave needs to have somewhat high frequencies, in the hundreds of kHz TODO why. But as you might imagine, that is hard to achieve by mechanical means such as a hand cranck like Hippolyte Pixiis alternator!
Interestingly, some of the first carrier wave generators were actually mechanical, e.g. the Alexanderson alternator.
But clearly such mechanical machines were not very scalable, and soon more electronic devices were introduced, notably the vacuum tube.
Century egg Updated 2025-07-16
Figure 1. . Source. One of the few Chinese things Ciro Santilli never got into!
sudo apt build-dep cataclysm-dda-curses cataclysm-dda-data cataclysm-dda-data
git clone https://github.com/CleverRaven/Cataclysm-DDA
cd Cataclysm-DDA
git checkout cdda-experimental-2022-01-27-0622
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DTILES=ON -DSOUND=ON -DLOCALIZE=OFF ..
make -j`nproc`
fails with:
:part_index_’ may be used uninitialized [-Werror=maybe-uninitialized]
   55 |             return part_index_;
as reported at: github.com/CleverRaven/Cataclysm-DDA/issues/52657 now open for 3 months. Basically every commit I tried fails with a different -Werror check, they don't test GCC new enough regularly.
Cataclysm DDA multiplayer Updated 2025-07-16
This would be a dream, but it is also impossible: how can you reconcile automated tasks that are simulated quickly like batch crafting 20 muffings in 30 in-game minutes, with someone who is at the same time fighting a hoard of zombies and taking one action every 2 in-game seconds? Alas.

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