The best open source implementation as of 2020 seems to be: Mozilla rr.
Debugging sucks. But there's also nothing quite that "oh fuck, that's why it doesn't work" moment, which happens after you have examined and placed everything that is relevant to the problem into your brain. You just can't see it coming. It just happens. You just learn what you generally have to look at so it happens faster.
Perfect Git integration belongs in integrated development environments :-)
Ubuntu 23.04 install:
sudo apt install rbaseHello world:
R -e 'print("hello world")'.data is section 1:00000080 01 00 00 00 01 00 00 00 03 00 00 00 00 00 00 00 |................|
00000090 00 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 |................|
000000a0 0d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000b0 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|- 80 4:
sh_type=01 00 00 00:SHT_PROGBITS: the section content is not specified by ELF, only by how the program interprets it. Normal since a.datasection. - 80 8:
sh_flags=037x00:SHF_WRITEandSHF_ALLOC: www.sco.com/developers/gabi/2003-12-17/ch4.sheader.html#sh_flags, as required from a.datasection - 90 0:
sh_addr= 8x00: TODO: standard says:but I don't understand it very well yet.If the section will appear in the memory image of a process, this member gives the address at which the section's first byte should reside. Otherwise, the member contains 0.
- 90 8:
sh_offset=00 02 00 00 00 00 00 00=0x200: number of bytes from the start of the program to the first byte in this section 00000200 48 65 6c 6c 6f 20 77 6f 72 6c 64 21 0a 00 |Hello world!.. |readelf -x .data hello_world.owhich outputs:Hex dump of section '.data': 0x00000000 48656c6c 6f20776f 726c6421 0a Hello world!.NASM sets decent properties for that section because it treats.datamagically: www.nasm.us/doc/nasmdoc7.html#section-7.9.2Also note that this was a bad section choice: a good C compiler would put the string in.rodatainstead, because it is read-only and it would allow for further OS optimizations.- a0 8:
sh_linkandsh_info= 8x 0: do not apply to this section type. www.sco.com/developers/gabi/2003-12-17/ch4.sheader.html#special_sections - b0 0:
sh_addralign=04= TODO: why is this alignment necessary? Is it only forsh_addr, or also for symbols insidesh_addr? - b0 8:
sh_entsize=00= the section does not contain a table. If != 0, it means that the section contains a table of fixed size entries. In this file, we see from thereadelfoutput that this is the case for the.symtaband.rela.textsections.
- a0 8:
Bundle assets into a single file in Phaser by 
Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01Summary: this is just a red herring. Wakatime owner likely registered the domains just after this article was published as a publicity stunt. Fair play though.
As raised at: news.ycombinator.com/item?id=36280666, many, but not all, of the domains currently redirect to wakatime.com/ as of 2023, and apparently they were taken up in 2013 (TODO how to confirm that). TODO what is the explanation for that? Some examples that do:But some failed resolution examples:Even more suspiciously, according to his LinkedIn: www.linkedin.com/in/alanhamlett/, the owner of Wakatime, Alan Hamlett, worked at WhiteHat Security, Inc from Aug 2011 - Sep 2013. The company was then acquired by Synopsys in 2022. Holy crap!!! As shown at: web.archive.org/web/20131013193406/https://www.whitehatsec.com/ that company made website security tools. Did that dude use the tools to find the vulnerabilty and then just gobble up all the domains??? What a fucking legend if he did!!!
Let's try:
Running e.g.gives:so we see that he must have setup redirection with Namecheap as mentioned at: www.namecheap.com/support/knowledgebase/article.aspx/385/2237/how-to-redirect-a-url-for-a-domain/
curl -vvv dedrickonline.com* Trying 162.255.119.197:80...
* Connected to dedrickonline.com (162.255.119.197) port 80 (#0)
> GET / HTTP/1.1
> Host: dedrickonline.com
> User-Agent: curl/7.88.1
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< Date: Mon, 12 Jun 2023 20:30:19 GMT
< Content-Type: text/html; charset=utf-8
< Content-Length: 55
< Connection: keep-alive
< Location: https://wakatime.com
< X-Served-By: Namecheap URL Forward
< Server: namecheap-nginx
<
<a href='https://wakatime.com'>Moved Permanently</a>.
* Connection #0 to host dedrickonline.com left intactLet's also try DNS history
- whoisrequest.com/history/:
- tools.whoisxmlapi.com/whois-history-search
- dedrickonline.com:
- CIA (registrar: Godaddy, registrant name: domainsbyproxy.com)
- Created Date: October 27, 2010 00:00:00 UTC
- Updated Date: October 28, 2013 00:00:00 UTC
- Expires Date: October 27, 2014 00:00:00 UTC
- Alan (namecheap):
- Created Date: June 11, 2023 09:59:25 UTC
- Expires Date: June 11, 2024 09:59:25 UTC
- CIA (registrar: Godaddy, registrant name: domainsbyproxy.com)
- activegaminginfo.com:
- CIA (Network Solutions, registrant name: LLC. Corral, Elizabeth|ATTN ACTIVEGAMINGINFO.COM|care of Network Solutions)
- Created Date: January 26, 2010 00:00:00 UTC
- Updated Date: November 27, 2010 00:00:00 UTC
- Expires Date: January 26, 2012 00:00:00 UTC
- Alan:
- Created Date: June 11, 2023 09:59:40 UTC
- Expires Date: June 11, 2024 09:59:40 UTC
- CIA (Network Solutions, registrant name: LLC. Corral, Elizabeth|ATTN ACTIVEGAMINGINFO.COM|care of Network Solutions)
- iraniangoalkicks.com:
- iraniangoals.com:
- CIA (registrar: Godaddy, registrant name: domainsbyproxy.com):
- Reuters:
- Created Date: September 29, 2022 11:16:09 UTC
- Updated Date: September 29, 2022 11:16:09 UTC
- Expires Date: September 29, 2023 11:16:09 UTC
- dedrickonline.com:
So these suggest Alan might have just come along in 2023 way after the 2022 Reuters article and did the same basic IP range search that Ciro is doing now, so possibly no new tech. Let's ask... twitter.com/cirosantilli/status/1668369786865164289
Searching tools.whoisxmlapi.com/reverse-whois-search with term "Corral, Elizabeth" gave no results unfortunately.
Basic search under tools.whoisxmlapi.com/reverse-whois-search for "Corral" also empty. They can't see their own data? Ah, need advanced. Marked "Historic" and selected "Corral, Elizabeth", ony one hit, activegaminginfo.com.
Clear client-side storage on Chromium by Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-18 +Created 1970-01-01Tested on Ubuntu 23.10;
git clone https://github.com/google-deepmind/mujoco
cd mujoco
git checkout 5d46c39529819d1b31249e249ca399f306a108ac
mkdir -p build
cd build
cmake ..
make -jNow let's play. Minimal interactive UI simulation of a simple MJCF scene with one falling cube:Test soure code: github.com/google-deepmind/mujoco/blob/5d46c39529819d1b31249e249ca399f306a108ac/sample/basic.cc. The only thing you can do is rotate the scene with the computer mouse it seems. Mentioned at: mujoco.readthedocs.io/en/2.2.2/programming.html#sabasic
bin/basic ../doc/_static/hello.xmlSome more interesting models can be found under the
model/ directory: github.com/google-deepmind/mujoco/tree/5d46c39529819d1b31249e249ca399f306a108ac/model E.g. the imaginary humanoid robot DeepMind used in many demos can be seen with:bin/basic ../model/humanoid/humanoid.xmlA more advanced UI with a few controls:Test soure code: github.com/google-deepmind/mujoco/tree/5d46c39529819d1b31249e249ca399f306a108ac/simulate. Mentioned at: mujoco.readthedocs.io/en/2.2.2/programming.html#sasimulate
bin/simulate ../doc/_static/hello.xmlA very cool thing about that UI is that you can manually control joints. There are no joints in the hello.xml, but e.g. with the humanoid model:under "Control" you move each joint of the robot separately which is quite cool.
bin/simulate ../model/humanoid/humanoid.xmlThere's also a Mentioned at: mujoco.readthedocs.io/en/2.2.2/programming.html#sarecord but TODO that produced a broken video, related issues:
bin/record test executable that presumably renders the simulation directly to a file:bin/record ../doc/_static/hello.xml 5 60 rgb.out
ffmpeg -f rawvideo -pixel_format rgb24 -video_size 800x800 -framerate 60 -i rgb.out -vf "vflip" video.mp4 Pinned article: ourbigbook/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 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . 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. 
- 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