Electrical conductance by Ciro Santilli 37 Updated +Created
bsdgames game by Ciro Santilli 37 Updated +Created
Build bsdgames from source by Ciro Santilli 37 Updated +Created
Many of the games are disabled by default on Ubuntu. But we can enable some games and build from source with:
apt-get source bsdgames
cd bsdgames-*
sed -ri '/^bsd_games_cfg_no_build_dirs=/s/ number / /' config.params
./configure
make -j
Here we enabled the game number, so now we can:
number/number 123
which gives:
one hundred twenty-three.
We can also "install" it locally with:
make install
which puts the games locally under:
debian/bsdgames/usr/games/number
which you can add to your PATH environment variable.
Tested on Ubuntu 24.04, bsdgames 2.17.
Signal generator by Ciro Santilli 37 Updated +Created
Are there infinitely many primes with property X by Ciro Santilli 37 Updated +Created
There are infinitely many conjectures asking if such types of primes also form infinite families.
Usually the answer is yes, but no one was able to prove it yet.
Electrical resistance and conductance by Ciro Santilli 37 Updated +Created
Metrology institute by Ciro Santilli 37 Updated +Created
Metrology by Ciro Santilli 37 Updated +Created
Type of prime number by Ciro Santilli 37 Updated +Created
This section is about prime numbers that satisfy further properties beyond just being a prime.
Physikalisch-Technische Bundesanstalt by Ciro Santilli 37 Updated +Created
The Mystery of Matter by Ciro Santilli 37 Updated +Created
Very good documentary! Explains things very well! Great acting and wardrobe too.
Particularly tasteful is their choice of native speaker actors who speak their native language for less important narration, and English with an accent for more important moments, in particular when talking solo to the camera.
Video 1.
The Mystery of Matter episode 1
. Source.
Video 2.
The Mystery of Matter episode 2
. Source. Covers:
Video 3.
The Mystery of Matter episode 3
. Source.
Japanese physics research institute by Ciro Santilli 37 Updated +Created
German physics research institute by Ciro Santilli 37 Updated +Created
Landau's problems by Ciro Santilli 37 Updated +Created
Generate random text in PostgreSQL by Ciro Santilli 37 Updated +Created
This one is good: stackoverflow.com/questions/36533429/generate-random-string-in-postgresql/44200391#44200391 as it also describes how to generate multiple values.
with symbols(characters) as (VALUES ('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'))
select string_agg(substr(characters, (random() * (length(characters) - 1) + 1)::INTEGER, 1), '')
from symbols
join generate_series(1,8) as word(chr_idx) on 1 = 1 -- word length
join generate_series(1,10000) as words(idx) on 1 = 1 -- # of words
group by idx;
Then you can insert it into a row with:
create table tmp(s text);
insert into tmp(s)
  select s from
  (
    with symbols(characters) as (VALUES ('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'))
    select string_agg(substr(characters, (random() * (length(characters) - 1) + 1)::INTEGER, 1), '') as asdf
    from symbols
    join generate_series(1,8) as word(chr_idx) on 1 = 1 -- word length
    join generate_series(1,10000) as words(idx) on 1 = 1 -- # of words
    group by idx
  ) as sub(s);
A more convenient approach is likely to define the function:
CREATE OR REPLACE FUNCTION random_string(int) RETURNS TEXT as $$
select
  string_agg(substr(characters, (random() * length(characters) + 1)::integer, 1), '') as random_word
from (values('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789    --')) as symbols(characters)
  join generate_series(1, $1) on 1 = 1
$$ language sql;
And then:
create table tmp(s text, t text);
insert into tmp(s) select random_string(10) from generate_series(10);
This section is about converting: www.gutenberg.org/ebooks/10, and most likely the plaintext version: stackoverflow.com/a/43060761/895245 to the same data format as www.kaggle.com/datasets/oswinrh/bible mapping book/chapter/verse to the text:
1 1 1 In the beginning God created the heaven and the earth.
1 1 2 And the earth was without form, and void; and darkness was upon the face of the deep.
On particular annoyance is that the txt version has multiple verses per line at times.
We'd likely just want to use a slightly modified version of: stackoverflow.com/a/43060761/895245 that searches for patterns of type:
(\d+):(\d+)
with incremental integers.
Visible Human Project by Ciro Santilli 37 Updated +Created
Frozen and cut on Microtome at 1mm intervals.

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