Where are my Minecraft worlds on Android?

The phone in question doesn't have an SD card. The games/com.mojang/minecraftWorlds folder is empty in the phone's filesystem. Where are all the worlds that are clearly being stored somewhere?

The answer turns out that all of the worlds we've been creating for years have been stored under "Application" rather than "External". and this setting stores them in a protected area of the file system which cannot normally be accessed either by USB or even the built-in file browser.

There are apparently three methods of accessing this area. 1) gain root access to the phone. Most people are scared to try this step. 2) For each world, upload it to Realms (using the 30 day free trial) and then download it to external. There are a couple of tricky parts to make sure this goes properly. 3) Some boffins created a tool called "Worlds Explorer" which takes advantage of an android backup utility to pull the data out of the phone and then extract the worlds. This seems the most painless but requires java and there's a whole lot of linked together applications that are needed to make it work.

The links:

The first thread that I found with the clue as to what the issue was. The answers are not great, including misleading once which advise starting to save to "External" (doesn't actually recover previous worlds stored in Applications, just makes sure your new worlds are in the external location) and a terrible write-up of the Realms trick. https://www.trueachievements.com/forum/viewthread.aspx?tid=989031

Another forum thread with a groping understanding of the problem, but then the creator of WorldsExplorer posted a link to his app: https://gaming.stackexchange.com/questions/311137/where-do-minecraft-pe-can-save-worlds-other-than-sdcard-games-com-mojang-minecra

A reddit thread that explains the problem succinctly but with no helpful answers: https://www.reddit.com/r/MCPE/comments/677n3a/i_cant_find_my_world_folder_on_mcpe_android/

Another reddit thread that explains the issue well. This thread contained a much clearer description of the Realms trick. https://www.reddit.com/r/MCPE/comments/7azwvd/so_is_it_confirmed_that_minecraft_worlds_saved_to/dped2qa/

This angel from heaven posted a YouTube video that simply and unambiguously walks you through how to do the Realms trick. https://www.youtube.com/watch?v=fdFIXZ2rfJs

Here is a forum thread that has reports from people who have used both the Realms trick and WorldsExplorer: https://feedback.minecraft.net/hc/en-us/community/posts/360009322871-Moving-Resources-from-Application-to-External-Storage-bedrock-mobile-originally-but-any-

Here is the link to WorldsExplorer (it's apparently actually called World Exporter): https://tikolu.net/worldExporter/

How to find AutoCAD drawings of parts on Digikey

Was it always this easy? How could I have not known?

First, know the manufacturer of the part I want a CAD file of the package of.

Then find that manufacturer on this list:

https://www.digikey.com/en/resources/3d-models

From the manufacturer's link on that page, again find the part. If the part has a CAD model, it will be findable when narrowing searches from this level down.

The part will have a link to the cat files on the manufacturer's site, which may or may not be correctly indexed.

Kahoot

For distance learning, the teachers at N's school thought that Kahoot would work for fun quizzes. It's an odd idea; somebody has to project the quiz questions to a group that's all presumably in a room together and everybody has to have their own phone to participate. Add in Zoom and having only iPads on our end and the only way to make it work was to have one iPad for the Zoom and one for answering the questions.

https://kahoot.com/study/

It is interesting that kahoot quizzes can be created by anybody for free, and the system for scoring all the answers seems fairly easy to use.

https://kahoot.com/schools/how-it-works/

Python hints for gain comparison script

Sources for fixing my bad coding for making the data graphs:

Directly setting the tick labels in matplotlib. Haven't gone here yet but this is apparently not a simple tweak although there is a formula for getting it right: https://stackoverflow.com/questions/11244514/modify-tick-label-text

The .plot() method for matplotlib and how it so nicely allows for multiple lines on the same plot: https://matplotlib.org/api/_as_gen/matplotlib.pyplot.plot.html

Extracting a column from a 2D list. 3 methods: 1) list conprehension, 2) just use numpy 3) zip https://stackoverflow.com/questions/30062429/python-how-to-get-every-first-element-in-2-dimensional-list/30062458

Initializing a list for my x axis values, explained for babies: https://www.science-emergence.com/Articles/How-to-create-a-list-of-numbers-in-python-/

Doing multiplication and division between elements of three arrays: Just use numpy. https://stackoverflow.com/questions/10271484/how-to-perform-element-wise-multiplication-of-two-lists

January 2020 Diversions

Fun:

"I turn an AC compressor into a working engine" it looks like he's using spark plugs? https://www.youtube.com/watch?v=SxqyfB83tSo

This infographic video of the the Glomar Explorer operation looks insanely stupid with the sound off, but it seems like it does contain facts so I can't keep from looking. https://www.youtube.com/watch?v=3SttYTYYLuk

Here is a nice HTML color code picker!
https://htmlcolorcodes.com/https://htmlcolorcodes.com/

WOW! This research into stress turning hair grey is amazingly conclusive! And now I know that it's too late for me.
https://www.bbc.com/news/health-51208972

December 2019 diversions

Work:

The make and model of the PDU salvaged for the EGSE rack: https://www.google.com/search?q=Belkin+F5C350&rlz=1C1GGRV_enUS753US753&oq=Belkin+F5C350

The realization that there have been several models of NI USB-GPIB dongles over the years, apparently A, B, HS, and now HS+
http://www.ni.com/en-us/shop/select/gpib-instrument-control-device?skuId=28506

ProCreate and other animation/drawing apps for T:

An adorable "Getting Started" guide filled with impossible looking examples: https://www.skillshare.com/blog/learn/procreate-101-everything-you-need-to-know-to-get-started

An artist's review of the iPad + ProCreate: https://steemit.com/art/@jillustrations/review-ipad-pro-apple-pencil-procreate-is-a-game-changer

Space twitters

Here are my favorite space themed twitter feeds:

Here is the twitter page of the guy who is constantly flying aerial spying missions at the Starship facility in Cocoa Beach:
https://twitter.com/John_Winkopp

Here is the Russian woman who recently went on an amazing tour of a CCCP space museum and who always has a great insider perspective on the back-room politics behind russian space news: https://twitter.com/katlinegrey

Here is DutchSpace, who reblogs a wide range of news, often with interesting opinions: https://twitter.com/DutchSpace

Copenhagen Suborbitals; this twitter is about the only way to keep up with their excruciatingly methodical progress: https://twitter.com/copsub