Ciro Santilli really likes this genre.
One of Ciro Santilli's favorites.
Seems to simulate the world in an extremely elaborate way.
Ciro can't help but to think that with a little content work, this game engine could also produce a Factorio-like (conveyor belts mentioned in passing at: discourse.cataclysmdda.org/t/vehicle-unloading/10783), or a The Sims-like, or an Stardew-valley-like. E.g. even stuff like house building is already included: www.youtube.com/watch?v=QnCYGSlZ1gE
They're also adding more and more allyied NPC management in "faction camps" it seems: www.reddit.com/r/cataclysmdda/comments/edg5y0/a_beginners_guide_to_faction_bases/ thus approaching the game further to Dwarf Fortress or RimWorld.
Ciro Santilli played this for 1 day and a half non-stop with save scumming in 2022, then he deleted his saves and uninstalled the game, and started Googling to see how end games can look like, as usual.
The problem is that it is a bit hard to find edited gameplay with highlights only, the type of people who play those games are just regular nerds right. But there is a lot of gameplay videos, just not edited ones.
Then two days later Ciro re-downloaded it and played more, just no so nonstop, the urge was too strong. Two days later, he deleted the save again after clearing out a middle sized town, and reaching a large town.
Then Ciro learned about debug menu, which is the best way to experience all buildings/weapons/abilities easily without grinding more than necessary. TODO any simple easy way to become invincible there? discourse.cataclysmdda.org/t/prompt-for-certain-debug-commands/19209/5Lol. Found a "Debug invincibility" and "Debug invisibility" under mutations.
We do not accept feature requests for the debug menu.
But a few days later he played a bit more for a day non-stop after having learnt some more techniques from YouTube, and then deleted again.
Ciro noticed that the part of this game that he likes the most is the early game. Raiding low populated areas like farms is joy. Once you get a car and stabilize, things become a bit less fun, and it is then just a matter of getting more and more powerful with a lot of routine work, which takes time. Sleeping in tents is quite tempting as well, there's a campfire overmap tile that is great. You can actually take down tents Ciro later learnt... that's awesome.
A major joy of this type of game is the ability to loot shops and homes without any moral implications since the former owners are all dead/zombified.
Another major joy is the incredible value you attach to items you discover, because they are truly life changing.
For example, Ciro was first obsessed with his duffel bag, which could carry huge volumes, and made fixing it a top priority once it got ripped!
Then he was obsessed about the 4x4 car he found, which looks like this:where:What a great design! Enough room for a lot of loot, and also the reinforced frame to kill zombies without destroying the car, all while not being overly heavy which spends a lot of fuel, not being too wide which makes maneuvering in cities with broken cars on the road hard! Also the trunks were large enough for large water tanks, which solves your clean water supply forever.
fffffF
fttsfF
fttsfF
fffffFf: frameF: reinforced framet: trunks: seat
Humvees are also good, but they are wider, have a lot of useless seats, and consume diesel, a lot of diesel, runs out very quickly. But they are even tougher than the 4x4, and have a turret that can fire at zombies.
It should be noted however that larger towns are generally just too much to use a car to clear, you will just waste too much fuel/car damage/real world time. The only way is to go at night it seems.
And then guns. The power of a guns is something to behold. Encounters that would easily be your death become one shot escapes. But of course, ammo is very limited, so you want to use each precious shot wisely! FEMA camps are a good place to get some easy powerful rifles and reasonable amount of ammo. Just drive in front of the entrance, and make the armed guards follow you out, then run them over. Try not to attract the zombie inside though, they are useless civilians without weapons, and just take up your time.
This game is also very good to learn some English if you are not a native, as you have to learn what all those bit and bobs you never needed to say before are.
The default tileset when running
cataclysm-tiles is a huge improvement over the text version, but still, could be a bit higher res. Overmap tilesets were only added in 2021 it seems: www.reddit.com/r/cataclysmdda/comments/pxtqsn/new_overmap_tileset_available/. Edit: 0.F appears to come with the proper Ultima tileset by defualt via cataclysm-dda-data Ubuntu 22.04 package. Fantastic!There are other built-in tiles under settings, but all of them are way too resolution for a casual gamer.
github.com/I-am-Erk/CDDA-Tilesets has a good tileset pack. To install on Ubuntu 21.10, drop the release under:and then select
~/.local/share/cataclysm-dda/gfx/UltCa from Settings > Tiles in the main menu. It does make things much more immediately understandable. Edit: after some initial plays, Ciro had a second look at the default -tiles graphics, and they are not so bad. But still, the higher resolution is better. Edit: looks like they are going to merge it in-tree, which is great! github.com/CleverRaven/Cataclysm-DDA/commits/master/gfx/UltimateCataclysmNo default sounds, but has a soundpacks mechanism. Sad for now default, but cool for the configurability:
Installation is similar to tilesets, but you put it under
sounds/ instead of gfx/. Restart required to select the soundpack option, and another restart required for the selected option to be used, clunky.This is the type of thing that prevents wider adoption of this game, it is just too hard to figure out things.
The other major requirement for casual players would be mouse clicking stuff with dropdown menus that show what you can do there (e.g.
E and Shift + G), and better menus, everything should be also doable with a mouse in addition to the keyboard shortcuts.Besides the zombies, it also has some high tech stuff like bionics and aliens mixed in. And mods add other stuff, e.g. cddawiki.chezzo.com/cdda_wiki/index.php?title=Magiclysm which is quite cool. The design document/lore spoilers explain that this is the actual cause of te cataclysm: cataclysmdda.org/lore-background.html
The cool thing about this type of game is that enemies are really powerful, which is so much more realistic. Even a single zombie has to be given lots of respect, especially since healing is a slow process like real life, and killing one feels like an achievement.
Some other cool points:
- www.reddit.com/r/cataclysmdda/comments/3m92cc/are_worlds_truly_infinite/ the map is truly infinite. Everything is persistent. They must freeze things in some state of course when the player is not around, and hydrate it (using React.js-like terminology!) when you come back, but they all look very plausibly continuous to how things where. They call the fully simulated world the "reality bubble": cddawiki.chezzo.com/cdda_wiki/index.php?title=Reality_bubble That pages says though that not everything hydrates. Shame there are no oceans yet: www.reddit.com/r/cataclysmdda/comments/huvnon/when_are_we_getting_oceans/But there are lakes, and lake islands: cddawiki.chezzo.com/cdda_wiki/index.php?title=Lake but they are quite rare on the mapgen, outside of fixed scenario starts.
Tips for beginners:
- a Reddit list: www.reddit.com/r/cataclysmdda/comments/hsxpco/things_you_wish_you_knew_when_you_started_playing/
- go to town at night, zombies are even blinder than you, it is possible to sneak by massive hoards, fighting one enemy at a time, even when they are well packed together. The only possible reason to go out during the day is to smash zombies with a car without crashing.
- favoriting items makes you not drop them by default with
,. This is fundamental so you can drop loot while keeping survival stuff on you. - indestructible and faster than you early game enemies, encounter means certain death: Survivor zombie, Giant cockroach, Giant wasp. Walking on trails is also potentially deadly, which is very annoying... sometimes you only see dealy enemies like wolves when you are on top of them on trails. Not sure what to do about that.
- pick up all items from any surrounding tile:
/, then on leftIfor inventory, on rightAfor area. You can also examine items witheif not everything fits, and sort by category withs. That's the most important menu in the game! - duffel bags are the best thing ever made, carry huge volumes, and you can craft them too!
- smash (
S) zombie corpses after you kill them, or else they will re-raise after a few hours. They will be wounded and easy to kill however. - just like in real life, cars are the ultimate killing machine. For some reason though, it does not smash zombie corpses. They can also carry infinite crap, after clearing up a town, you can just pick up EVERYTHING without thinking too much, just hit
,. To bulk move things into/off a car, just hold Enter until the inventory is full. So sort huge piles by category: Shift + V then S:.Just like in real life, bicycles are pretty good if you can't find a working car, as they don't consume fuel, just stamina. You can even go around hordes if you are crazy enough, and try to look for working cars in towns, but going on the countryside would be wiser. Just make sure you always have enough stamina to cycle out to safety if your electric motor isn't working, which is often the case!Electric cars can also be recharged from the sun, which means they will never run out. They are generally not very strong, so not suitable for ramming, and the battery runs out relatively soon. But great to stop out of town. - head encumbrance does not seem to do anything besides limit how many hats you can wear, so do ware that motorcycle helmet: www.reddit.com/r/cataclysmdda/comments/a5nq6c/head_encumbrance/
- headlamps are a must
- on the overmap
m, you can fast travel withShift + Wtwice. Not perfect path finding, but saves a lot of useless clicking! - on the EVAC shelter computer, contact us is not useless at all! It shows the nearest refugee center, and can show a lot of map because it shows the full road path there
- climb buildings to see further out. You can start by climbing the EVAC shelter via gutter with
>! But to go down pipes you have to examine it, not<, it's weird. Edit: actually, you can "climb down" any ledge, so that's why. But you can still get hurt, so don't do it unless it is really necessary. You will want to carry the telescope, or a binoculars with you at all times most likely, as it is just a huge asset. You just can't climb back up without the water pipe. Radio tower and silos are other good buildings to climb, and radio towers often contain telescopes which allow you to see very very far, climbing those is a top priority when scouting a new region. Don't jump down, even of 1 floor, as it hurts you. A bit exaggerated, but so be it. - you can grind fabrication easily to level 1 even without a book: www.reddit.com/r/cataclysmdda/comments/6r2477/best_way_to_grind_fabrication/ This is fundamental to make the all important brazier. And you'll learn that dumping things in the brazier unnecessarily burns them out, the uninsuitive "Construct" > "Firewood Source" is a must.
- place brazier immediately outside of the EVAC shelter window, this way you avoid smoke problems, but can still cook from the inside.
- shopping carts are the very best mechanism to carry a lot of loot in town besides a car. And there's a foldable version that can fit into cars, but you have to craft it... www.youtube.com/watch?v=kccBl7cksPY. Most important item ever.
- there's a built-in debug menu that allows you to cheat whatever you want: spawn items, change your stats (e.g. 10000 strenght and smash through walls? no problem), learn skills, reveal map, and teleport. You have to bind a key to it before using it from
?,,is a good bind candidate. Now that's real fun, being God. - auto-smash mode is a must
- you likely should look into spears: www.reddit.com/r/cataclysmdda/comments/7m99jb/why_melee_with_anything_besides_spears/. Reach attacks from spears are OP, as you can hit a zombie, run, wait for it to come in range, hit from afar, run, and so on. Then after killing a zombie, you wait until your stamina recovered with
|. This allows to safely kill anything as fast as you without taking hits. Wooden spear is a good first one, and it is not flimsy and lasts a while, like 30-50 zombies maybe. A pitch fork is another good option if you can find one.
How a typical early day looks like for a newbie: go to down, fight 5 zombies, get some stuff from houses, and run back home because your limbs are too weak and could break. Get home 10AM, and read the hole day and night. Repeat.
A fun play style is: get a car, clear out a small town with a library, bring food and books back to the base, fill the 4 60L tanks with water and bring them on the car as well, and then just read for several days until the food runs out. Repeat. It is not super serious if you don't have a car though, as even "shallow water" pools found in every forest can fill one of them. Exploitative mechanic BTW.
Top feature requests for Ciro Santilli:
- www.reddit.com/r/cataclysmdda/comments/2mni5z/can_i_store_items_in_a_backpack_and_drop_the/. As of 0.E-3-1, drop happens automatically on Take off, but then you have to pick up items that go overweight/volume one by one.
- find items in my inventory by quality, or at least all item qualities in a single sortable table, otherwise it is too hard to know which item can do what
- fill all empty containers with something, e.g. water from a large pool into 25 plastic bottles
- view wound details without having to select bandage or antiseptic.
@"EFFECTS" has a summary, but it is too tiny, that stats window should be fullscreen for sure - realism requests. Ciro is a big fan of realism in CDDA, the more the better, and if you don't like something, just use the debug menu!
- shitting/peeing system
- when you wash clothes (currently important because zombie worn clothes that you pickup are generally filthy and reduce morale), make the clothes wet and require drying. There are even already some rotation clothes handers in houses, but just putting on a bench would be enough. And of course, higher temperatures mean faster drying, next to a fire would be ideal. Wearing wet clothes would of course make you cold and demoralized.
- exercise/fitness
TODO how to create a custom non random map/scenario? Possible from JSON: discourse.cataclysmdda.org/t/guide-to-adding-new-content-to-cdda-for-first-time-modders/17781/13/ ?
Their dominating Q&A communication channels are terrible, as of 2021 everything you google leads to: www.reddit.com/r/cataclysmdda/ which suffers from online forums that lock threads after some time are evil (edit: this changed since). They've since made a discourse thankfully however: discourse.cataclysmdda.org/
Source code overview:
- it is funny how the
lang/directory with translations is by far the largest of the repo ta 100MB, way larger thangfx, it's comical
One of the things it simulates is some level of builing stuff:
- you can build a wooden house: www.youtube.com/watch?v=QnCYGSlZ1gE including floor, roof, windows. There are also concrete walls. Of course, building is useless, what you really want is a super mega truck that doubles as a home.
- TODO can you generate power e.g. in solar cells or not, and wire it into home appliances? www.reddit.com/r/cataclysmdda/comments/4zm7tf/solar_panels_useless/ from 2016 says no.The solution would be simple... just mark the edge incoming wire from the reality bubble as a magic source that has a given voltage/max amperage/total power or total wattage available. Would be good enough. Sure, some estimates might be hard, e.g. how much sun is there in a far away location of the map, etc. but just having some average of those values would be good enough. E.g. average temperature of an off bubble tile would also be useful to calculate food rotting time.
- cddawiki.chezzo.com/cdda_wiki/index.php?title=Power says yes "farmhouse kitchen running off of outside solar, cabled in"
- www.reddit.com/r/cataclysmdda/comments/9j9e16/wired_homes_and_electrical_systemgrid/ from 2018 says no due to fundamental reality bubble limitations, the only way is with power coming from stuff mounted on vehicles...
A related obvious application would be refrigerators. www.youtube.com/watch?v=G6B0KBJHvZs from 2021 mentions again that you can't have power without vehicles. TODO do the refrigerators in a powered 01 lab protect food?The fork github.com/cataclysmbnteam/Cataclysm-BN is actually trying to add an electric grid...
Cataclysm: Dark Days Ahead Review by SsethTzeentach (2018)
Source. This game really is right up Seth's alley, glad he tried it out. Perhaps his review was partly what motivated Ciro Santilli to give it a try. But the other part, perhaps even more important, was the joy of trying out crappy open source video games. Ciro especially likes Seth's observation that you could just go all in Mad Max mode. Since vehicles are so powerful, you can just clean up towns with them and basic weapons, then either get a new vehicle when the old one goes bust, or at least very easily find gas. Another good observation is that crafting in this game is amazing.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`:part_index_’ may be used uninitialized [-Werror=maybe-uninitialized]
55 | return part_index_;-Werror check, they don't test GCC new enough regularly.These are the best articles ever authored by Ciro Santilli, most of them in the format of Stack Overflow answers.
Ciro posts update about new articles on his Twitter accounts.
Some random generally less technical in-tree essays will be present at: Section "Essays by Ciro Santilli".
- Trended on Hacker News:
- CIA 2010 covert communication websites on 2023-06-11. 190 points, a mild success.
- x86 Bare Metal Examples on 2019-03-19. 513 points. The third time something related to that repo trends. Hacker news people really like that repo!
- again 2020-06-27 (archive). 200 points, repository traffic jumped from 25 daily unique visitors to 4.6k unique visitors on the day
- How to run a program without an operating system? on 2018-11-26 (archive). 394 points. Covers x86 and ARM
- ELF Hello World Tutorial on 2017-05-17 (archive). 334 points.
- x86 Paging Tutorial on 2017-03-02. Number 1 Google search result for "x86 Paging" in 2017-08. 142 points.
- x86 assembly
- What does "multicore" assembly language look like?
- What is the function of the push / pop instructions used on registers in x86 assembly? Going down to memory spills, register allocation and graph coloring.
- Linux kernel
- What do the flags in /proc/cpuinfo mean?
- How does kernel get an executable binary file running under linux?
- How to debug the Linux kernel with GDB and QEMU?
- Can the sys_execve() system call in the Linux kernel receive both absolute or relative paths?
- What is the difference between the kernel space and the user space?
- Is there any API for determining the physical address from virtual address in Linux?
- Why do people write the
#!/usr/bin/envpython shebang on the first line of a Python script? - How to solve "Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)"?
- Single program Linux distro
- QEMU
- gcc and Binutils:
- How do linkers and address relocation works?
- What is incremental linking or partial linking?
- GOLD (
-fuse-ld=gold) linker vs the traditional GNU ld and LLVM ldd - What is the -fPIE option for position-independent executables in GCC and ld? Concrete examples by running program through GDB twice, and an assembly hello world with absolute vs PC relative load.
- How many GCC optimization levels are there?
- Why does GCC create a shared object instead of an executable binary according to file?
- C/C++: almost all of those fall into "disassemble all the things" category. Ciro also does "standards dissection" and "a new version of the standard is out" answers, but those are boring:
- What does "static" mean in a C program?
- In C++ source, what is the effect of
extern "C"? - Char array vs Char Pointer in C
- How to compile glibc from source and use it?
- When should
static_cast,dynamic_cast,const_castandreinterpret_castbe used? - What exactly is
std::atomicin C++?. This answer was originally more appropriately entitled "Let's disassemble some stuff", and got three downvotes, so Ciro changed it to a more professional title, and it started getting upvotes. People judge books by their covers. notmain.o 0000000000000000 0000000000000017 W MyTemplate<int>::f(int) main.o 0000000000000000 0000000000000017 W MyTemplate<int>::f(int)Code 1.. From: What is explicit template instantiation in C++ and when to use it?nmoutputs showing that objects are redefined multiple times across files if you don't use template instantiation properly
- IEEE 754
- What is difference between quiet NaN and signaling NaN?
- In Java, what does NaN mean?
Without subnormals: +---+---+-------+---------------+-------------------------------+ exponent | ? | 0 | 1 | 2 | 3 | +---+---+-------+---------------+-------------------------------+ | | | | | | v v v v v v ----------------------------------------------------------------- floats * **** * * * * * * * * * * * * ----------------------------------------------------------------- ^ ^ ^ ^ ^ ^ | | | | | | 0 | 2^-126 2^-125 2^-124 2^-123 | 2^-127 With subnormals: +-------+-------+---------------+-------------------------------+ exponent | 0 | 1 | 2 | 3 | +-------+-------+---------------+-------------------------------+ | | | | | v v v v v ----------------------------------------------------------------- floats * * * * * * * * * * * * * * * * * ----------------------------------------------------------------- ^ ^ ^ ^ ^ ^ | | | | | | 0 | 2^-126 2^-125 2^-124 2^-123 | 2^-127Code 2.Visualization of subnormal floating point numbers vs what IEEE 754 would look like without them. From: What is a subnormal floating point number?
- Computer science
- Algorithms
Figure 5. Average insertion time into heaps, binary search tree and hash maps of the C++ standard library. Source. From: Heap vs Binary Search Tree (BST)
- Is it necessary for NP problems to be decision problems?
- Polynomial time and exponential time. Answered focusing on the definition of "exponential time".
- What is the smallest Turing machine where it is unknown if it halts or not?. Answer focusing on "blank tape" initial condition only. Large parts of it are summarizing the Busy Beaver Challenge, but some additions were made.
- Algorithms
- Git
| 0 | 4 | 8 | C | |-------------|--------------|-------------|----------------| 0 | DIRC | Version | File count | ctime ...| 0 | ... | mtime | device | 2 | inode | mode | UID | GID | 2 | File size | Entry SHA-1 ...| 4 | ... | Flags | Index SHA-1 ...| 4 | ... |Code 3.ASCII art depicting the binary file format of the Git index file. From: What does the git index contain EXACTLY?tree {tree_sha} {parents} author {author_name} <{author_email}> {author_date_seconds} {author_date_timezone} committer {committer_name} <{committer_email}> {committer_date_seconds} {committer_date_timezone} {commit message}Code 4.Description of the Git commit object binary data structure. From: What is the file format of a git commit object data structure?- How do I clone a subdirectory only of a Git repository?
- Python
- Web technology
- OpenGL
Figure 7. OpenGL rendering output dumped to a GIF file. Source. From: How to use GLUT/OpenGL to render to a file?- What are shaders in OpenGL?
- Why do we use 4x4 matrices to transform things in 3D?
Figure 10. Sinusoidal circular wave heatmap generated with an OpenGL shader at 60 FPS on SDL. Source.
- Node.js
- Ruby on Rails
- POSIX
- What is POSIX? Huge classified overview of the most important things that POSIX specifies.
- Systems programming
- What do the terms "CPU bound" and "I/O bound" mean?
Figure 12. Plot of "real", "user" and "sys" mean times of the output of time for CPU-bound workload with 8 threads. Source. From: What do 'real', 'user' and 'sys' mean in the output of time?+--------+ +------------+ +------+ | device |>---------------->| function 0 |>----->| BAR0 | | | | | +------+ | |>------------+ | | | | | | | +------+ ... ... | | |>----->| BAR1 | | | | | | +------+ | |>--------+ | | | +--------+ | | ... ... ... | | | | | | | | +------+ | | | |>----->| BAR5 | | | +------------+ +------+ | | | | | | +------------+ +------+ | +--->| function 1 |>----->| BAR0 | | | | +------+ | | | | | | +------+ | | |>----->| BAR1 | | | | +------+ | | | | ... ... ... | | | | | | +------+ | | |>----->| BAR5 | | +------------+ +------+ | | | ... | | | +------------+ +------+ +------->| function 7 |>----->| BAR0 | | | +------+ | | | | +------+ | |>----->| BAR1 | | | +------+ | | ... ... ... | | | | +------+ | |>----->| BAR5 | +------------+ +------+Code 5.Logical struture PCIe device, functions and BARs. From: What is the Base Address Register (BAR) in PCIe?
- Electronics
- Raspberry Pi
Figure 13. Raspberry Pi 2 directly connected to a laptop with an Ethernet cable. Image from answer to: How to hook up a Raspberry Pi via Ethernet to a laptop without a router?
Figure 14. . Image from answer to: How to hook up a Raspberry Pi via Ethernet to a laptop without a router? 
Figure 15. . Image from answer to: How to emulate the Raspberry Pi 2 on QEMU? 
Figure 16. Bare metal LED blinker program running on a Raspberry Pi 2. Image from answer to: How to run a C program with no OS on the Raspberry Pi?
- Raspberry Pi
- Computer security
- Media
Video 2. Canon in D in C. Source.The original question was deleted, lol...: How to programmatically synthesize music?- How to resize a picture using ffmpeg's sws_scale()?
- Is there any decent speech recognition software for Linux? ran a few examples manually on
vosk-apiand compared to ground truth.
- Eclipse
- Computer hardware
- Scientific visualization software
Figure 17. VisIt zoom in 10 million straight line plot with some manually marked points. Source. From: Section "Survey of open source interactive plotting software with a 10 million point scatter plot benchmark by Ciro Santilli"
- Numerical analysis
- Computational physics
- Register transfer level languages like Verilog and VHDL
- Verilog:
Figure 19. . See also: Section "Verilator interactive example"
- Verilog:
- Android
Video 4. Android screen showing live on an Ubuntu laptop through ADB. Source. From: How to see the Android screen live on an Ubuntu desktop through ADB?
- Debugging
- Program optimization
- What is tail call optimization?
Figure 21. . Source. The answer compares gprof, valgrind callgrind, perf and gperftools on a single simple executable.
- Data
Figure 22. Mathematics dump of Wikipedia CatTree. Source. In this project, Ciro Santilli explored extracting the category and article tree out of the Wikipedia dumps.
- Mathematics
Figure 23. Diagram of the fundamental theorem on homomorphisms by Ciro Santilli (2020)Shows the relationship between group homomorphisms and normal subgroups.- Section "Formalization of mathematics": some early thoughts that could be expanded. Ciro almost had a stroke when he understood this stuff in his teens.
Figure 24. Simple example of the Discrete Fourier transform. Source. That was missing from Wikipedia page: en.wikipedia.org/wiki/Discrete_Fourier_transform!
- Network programming
- Physics
- What is the difference between plutonium and uranium?
Figure 25. Spacetime diagram illustrating how faster-than-light travel implies time travel. From: Does faster than light travel imply travelling back in time?
- Biology
Figure 26. Top view of an open Oxford Nanopore MinION. Source. From: Section "How to use an Oxford Nanopore MinION to extract DNA from river water and determine which bacteria live in it"
Figure 27. Mass fractions in a minimal growth medium vs an amino acid cut in a simulation of the E. Coli Whole Cell Model by Covert Lab. Source. From: Section "E. Coli Whole Cell Model by Covert Lab"
- Quantum computing
- Section "Quantum computing is just matrix multiplication"
Figure 28. Visualization of the continuous deformation of states as we walk around the Bloch sphere represented as photon polarization arrows. From: Understanding the Bloch sphere.
- Bitcoin
- GIMP
Figure 29. GIMP screenshot part of how to combine two images side-by-side in GIMP?
- Home DIY
Figure 30. Total_Blackout_Cassette_Roller_Blind_With_Curtains.Source. From: Section "How to blackout your window without drilling"
- China
This game is quite detailed: www.youtube.com/watch?v=w4Jmqp8a_bU
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 3. Visual Studio Code extension installation.
Figure 4. Visual Studio Code extension tree navigation.
Figure 5. Web editor. You can also edit articles on the Web editor without installing anything locally.Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.Video 4. OurBigBook Visual Studio Code extension editing and navigation demo. Source. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact