Remarkable 2 is really, really good. Relatively fast refresh + touchscreen is amazing.
No official public feedback forum unfortunately:
PDF table of contents could be better: twitter.com/cirosantilli/status/1459844683925008385
CIA 2010 covert communication websites Internet Census 2012 by 
Ciro Santilli 37 Updated 2025-05-13 +Created 1970-01-01
Ciro Santilli 37 Updated 2025-05-13 +Created 1970-01-01Does not appear to have any reverse IP hits unfortunately: opendata.stackexchange.com/questions/1951/dataset-of-domain-names/21077#21077. Likely only has domains that were explicitly advertised.
We could not find anything useful in it so far, but there is great potential to use this tool to find new IP ranges based on properties of existing IP ranges. Part of the problem is that the dataset is huge, and is split by top 256 bytes. But it would be reasonable to at least explore ranges with pre-existing known hits...
We have started looking for patterns on
66.* and 208.*, both selected as two relatively far away ranges that have a number of pre-existing hits. 208 should likely have been 212 considering later finds that put several ranges in 212.tcpip_fp:
- 66.104.
- 66.104.175.41: grubbersworldrugbynews.com: 1346397300 SCAN(V=6.01%E=4%D=1/12%OT=22%CT=443%CU=%PV=N%G=N%TM=387CAB9E%P=mipsel-openwrt-linux-gnu),ECN(R=N),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=N),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.104.175.48: worlddispatch.net: 1346816700 SCAN(V=6.01%E=4%D=1/2%OT=22%CT=443%CU=%PV=N%DC=I%G=N%TM=1D5EA%P=mipsel-openwrt-linux-gnu),SEQ(SP=F8%GCD=3%ISR=109%TI=Z%TS=A),ECN(R=N),T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.104.175.49: webworldsports.com: 1346692500 SCAN(V=6.01%E=4%D=9/3%OT=22%CT=443%CU=%PV=N%DC=I%G=N%TM=5044E96E%P=mipsel-openwrt-linux-gnu),SEQ(SP=105%GCD=1%ISR=108%TI=Z%TS=A),OPS(O1=M550ST11NW6%O2=M550ST11NW6%O3=M550NNT11NW6%O4=M550ST11NW6%O5=M550ST11NW6%O6=M550ST11),WIN(W1=1510%W2=1510%W3=1510%W4=1510%W5=1510%W6=1510),ECN(R=N),T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.104.175.50: fly-bybirdies.com: 1346822100 SCAN(V=6.01%E=4%D=1/1%OT=22%CT=443%CU=%PV=N%DC=I%G=N%TM=14655%P=mipsel-openwrt-linux-gnu),SEQ(TI=Z%TS=A),ECN(R=N),T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.104.175.53: info-ology.net: 1346712300 SCAN(V=6.01%E=4%D=9/4%OT=22%CT=443%CU=%PV=N%DC=I%G=N%TM=50453230%P=mipsel-openwrt-linux-gnu),SEQ(SP=FB%GCD=1%ISR=FF%TI=Z%TS=A),ECN(R=N),T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.175.106
- 66.175.106.150: noticiasmusica.net: 1340077500 SCAN(V=5.51%D=1/3%OT=22%CT=443%CU=%PV=N%G=N%TM=38707542%P=mipsel-openwrt-linux-gnu),ECN(R=N),T1(R=N),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
- 66.175.106.155: atomworldnews.com: 1345562100 SCAN(V=5.51%D=8/21%OT=22%CT=443%CU=%PV=N%DC=I%G=N%TM=5033A5F2%P=mips-openwrt-linux-gnu),SEQ(SP=FB%GCD=1%ISR=FC%TI=Z%TS=A),ECN(R=Y%DF=Y%TG=40%W=1540%O=M550NNSNW6%CC=N%Q=),T1(R=Y%DF=Y%TG=40%S=O%A=S+%F=AS%RD=0%Q=),T2(R=N),T3(R=N),T4(R=N),T5(R=Y%DF=Y%TG=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=),T6(R=N),T7(R=N),U1(R=N),IE(R=N)
Maxwell's equations require special relativity by Ciro Santilli 37 Updated 2025-05-13 +Created 1970-01-01
Ciro Santilli 37 Updated 2025-05-13 +Created 1970-01-01The following aspects of Maxwell's equations make no sense without special relativity:
- the Lorentz force would be different observers have different speeds, see e.g.: charged particle moving at the same speed of electrons thought experiment
- Maxwell's equations imply that the speed of light is the same for all inertial reference frames
When charged particle though experiment are seen from the point of view of special relativity, it becomes clear that magnetism is just a direct side effect of charges being viewed in special relativity. One is philosophically reminded of how spin is the consequence of quantum mechanics + special relativity.
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