Ravi Shankar Updated 2025-07-16
C++ library Updated 2025-07-16
Amazon EC2 hello world Updated 2025-07-16
Let's get SSH access, instal a package, and run a server.
As of December 2023 on a t2.micro instance, the only one part of free tier at the time with advertised 1 vCPU, 1 GiB RAM, 8 GiB disk for the first 12 months, on Ubuntu 22.04:
$ free -h
               total        used        free      shared  buff/cache   available
Mem:           949Mi       149Mi       210Mi       0.0Ki       590Mi       641Mi
Swap:             0B          0B          0B
$ nproc
1
$ df -h /
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       7.6G  1.8G  5.8G  24% /
To install software:
sudo apt update
sudo apt install cowsay
cowsay asdf
Once HTTP inbound traffic is enabled on security rules for port 80, you can:
while true; do printf "HTTP/1.1 200 OK\r\n\r\n`date`: hello from AWS" | sudo nc -Nl 80; done
and then you are able to curl from your local computer and get the response.
Delft OpenCourseWare Updated 2025-07-16
They have a lot of stuff, well done.
CC BY-NC-SA by default unfortunately, but what can you do...
Erhu player Updated 2025-07-16
Wall Street Updated 2025-07-16
Universal Turing machine Updated 2025-07-16
A Turing machine that simulates another Turing machine/input pair that has been encoded as a string.
In other words: an emulator!
The concept is fundamental to state several key results in computer science, notably the halting problem.
Tree representation Updated 2025-07-16
This section is about ways in which you can represent a tree.
Trees are a specific type of graph, so any graph representation also provides a way to represent a tree.
Therefore this section will focus only on methods specific to tress, and which cannot be used for graphs in general.
Typeface Updated 2025-07-16
Wikipedia lore Updated 2025-07-16
Video 1.
What Mental Breakdown Of a Wikipedia Moderator looks like by Vince Vintage
. Source.
Mutation Updated 2025-07-16
Vacuum engineering Updated 2025-07-16
Video 1.
Air-tight vs. Vacuum-tight by AlphaPhoenix (2020)
Source. Shows how to debug a leak in an ultra-high vacuum system. Like every other area of engineering, you basically bisect the machine! :-) By Brian Haidet, a PhD at University of California, Santa Barbara.

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