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The Christmas video is out ... on the 24th (we give presents on the 24th in Germany :) Merry Christmas/Fröhliche Weihnachten everybody! 

Hello everyone, I just uploaded a new video. It delves into some new visually appealing enhancements to how we approach the volume and surface area formulas of spheres. While working on it, I played around with a few different designs for the thumbnail. Which of these designs do you find most "clickable" ? 

I should know by now that once a nice topic has been covered on YouTube, no matter how meh, it's not a good idea to cover the same topic again to fix things. Because if you do, don't expect many people to watch your masterpiece :(  In fact, I do know and yet I just made the same mistake again: A video on Gabriel's horn (done to death ... badly). Before that it was Conway's soldiers. Before that it was mathematical table turning, etc. Anyway, since you are reading this, I am assuming that you are one of the Mathologer regulars. And, as a regular, and if you are familiar with one of those Mathologer remakes, did it make enough of a difference to be worth the effort, at least as far as you were concerned? Should I keep giving in to the urge to fix things on YouTube? 

YOUTUBE IS WEIRD. Quick question for you. I am assuming that since you are looking at this post you are also among my viewers who get alerts about new videos early on. When the last video on visual logarithms went up, relatively few of you actually watched it straightaway and this video remained fairly unpopular during the first 2-3 weeks (mostly regular viewers) of its life on YouTube. Only recently this video has started to attract more viewers. In fact, this is my only video the like/dislike ratio of which has been RISING since it was published. Anyway, just trying to figure out what is going on here. And, so, if you got notified early and you did not end up watching this video, why was that? 

If you like math(s) and k-dramas the new video is for you :) 

Thank you all for supporting Mathologer in 2022. I put a short Mathologer Christmas video on the second channel Mathologer 2:  https://youtu.be/WY5X_3q80WY   It's an animation of Nicomachus's amazing odd number magic with a nice Christmassy twist. Enjoy :) 

Questions about the last (short) Mathologer video on an unusual generalization of  3² + 4² = 5². I am trying to figure out whether I should make more of these in between the usual Kurosawa length videos and also what works and does not work for you as far as this video is concerned. So far the video is doing okay but not great both in terms of views and likes. On the other hand, about 55% of people who click on it watch the whole thing which is very good. There are a quite a few of people who really engage with what I am talking about, do their own research, etc. (as a consequence a few nice little discoveries have already been made that I think are new!). Also, I really enjoyed making the animations for this video and just in general the whole thing was a welcome break from making these longer videos which always takes weeks. Now here are my questions to you: If you decided against watching the video, why did you? If you usually like Mathologer videos but did not this time, why not? If you did watch the video, were you able to appreciate what I show there as something worth doing? Are you waiting for the video on Galois theory or a part two of the Bernoulli numbers video and are you not really interested in watching anything else? Should I persist with making videos about little mathematical gems like this? Any other feedback on Mathologer in general? Apart from that. Thank you all for watching my videos. Merry Christmas and a Happy New Year :) 

I am getting a lot of complaints from subscribers that they were not notified of the last two videos (twisted squares and number walls). What about you? 

Hello everybody, today's video is about a new simple rubber band powered way to make slide rules. Real mathematical magic! While working on this video I stumbled across a lot of interesting tidbits: The international slide rule competition  https://www.sliderulemuseum.com/ISRC/ISRC_Practice_Problem_Set_PPS-1.pdf 
 https://www.sliderulemuseum.com/ISRC.htm , Dr Stranglove and Spock (screenshot in the video) using slide rules, the longest slide rule (over 100 meters long)  http://mit-a.com/TexasMagnum.shtml , slide rule powered flight computers that are still in use today, etc. Lots and lots of fun. Don't miss out on the description of this video for a lot of interesting tangents to get lost on :) 

Quick animated solutions to one of the challenges in the latest Mathologer video. Enjoy :)