How do I reverse an unconfirmed transaction to the original wallet

Is there an easy to understand step by step guide I can execute to create a double spend and get the unconfirmed transaction reversed back into the original wallet so I can resend it with a higher fee and get it delivered?

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Does “reverse sound technology” make headphones safer?

Purebuds Earphones claims that their use of “Reverse Sound Technology” makes their earbuds safer, preventing hearing damage. I searched for a scientific study of this technology, or at least a good explanation of it, but couldn’t find much.

From what I can understand, the speaker in the earbud is pointed away from the ear, so the sound isn’t emitted directly into the ear canal.

From reading reviews of the earbuds, they are actually quite loud and the bass is just as prominent if not more so.

Has Purebuds’ claim that their earbuds are safer ever been scientifically tested?

Link to the earbuds (dead; see archive.org backup)

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Can you play three skips then a reverse?

In a two-player Uno game, can the same person play 3 skips and immediately continue with a reverse of the same colour?

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Reverse center pull cantilever brakes (how to set up and issues)

Questions

Q1. For rear cantilever brakes, are there any off-the-shelf parts or brake designs that route a rear brake cable from underneath the saddle cable instead of above?

Q2. If not, then can anyone suggest an improvised, but proven setup using existing, readily-available parts?

Q3. What concerns should I have with a reverse-pull cantilever brake setup (e.g. safety, maintenance)?

Background

I have a mixte frame with standard rear cantilever brake bosses on the seat stays, with standard cantilever brakes such as these:

classic wide cantilever brakes

Since the frame is a mixte, the rear brakes are higher than the “top tube” of the mixte, along which runs my rear brake cable.

I’ve seen that some mixtes use a reverse cable attachment to side-pull caliper brakes so that the cable makes a single arc from the top tube to the brakes.
My goal is to roughly mimic this cable routing, but with cantilever brakes instead. Here is an example (but mine does not have a rack to work around):

a reverse-pull caliper brake setup

The original build is pictured below (not the actual bike, but same model, etc.) and has the rear brake cable running along the “top tube”, curving along the back of the seat tube, and then going over a pulley that is attached to the seat tube clamp bolt. That pulley acts as a housing stop and so it’s a center-pull from the top. I am looking to improve the rear brake responsiveness, put less stress and wear on the cable, and have fun engineering a more elegant solution.

Schwinn Mirada rear brake setup

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What’s with the reference to “Alice in Wonderland” in Nalo Hopkinson’s “The Reverse Cheshire Cat”?

Nalo Hopkinson’s “The Reverse Cheshire Cat” is obviously making a reference to Lewis Carroll’s Alice in Wonderland, with the Cheshire Cat. The two protagonists enter a shop named “The Reverse Cheshire Cat”:

The weather-blasted chipboard sign over the diner read “The Reverse Cheshire Cat.” The barely visible image showed an alarmed-looking cat clinging upside down from — was that a surveillance camera pole? Prof chuckled. “Bet there’s a story there.”

But this is the only time in the story the name is mentioned.

Why is Alice in Wonderland being referenced here – and specifically, the Cheshire Cat – and why is this single mention important enough that it made its way to the title?

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Reverse engineer 4-bit CRC in LG IR packet

I am reverse engineering IR protocol of LG air conditioner. AC generally send the whole current state of remote on each key press. Data sent is 28 bits long, last 4 bits seem to be the checksum. I have already tried reveng, but without luck.

Bits 14-16 are mode of operation (heat/cool/fan/auto). Bits 17-20 are temperature + 15 degrees, bits 22-24 are fan speed and bits 25-28 seem to be 4-bit checksum.

Here are sample values:

100010000000100001000101 0001
100010000000100001010101 0010
100010000000100001100101 0011
100010000000100010000100 0100
100010000000100011000101 1001
100010000000100011010101 1010
100010000000100011110101 1100
100010000000000011000101 0001
100010001100000000000101 0001

In the last two, only the position of 11 changed, but checksum stayed the same. How is that checksum calculated?

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How do I reverse engineer .so files found in android APKs?

I know how to reverse engineer normal android APKs using tools like APK-tool anddex2jar but i don’t know how to work with obfuscation. Can anyone help or atleast provide some pointers? I know this largely constitues learning by myself but I really don’t know what to look or where to look. Some examples would be really helpful. Thanks!

Edit:

When I extract everything from APK, I get some SMALI files (I tried JD-GUI but the strings contained random names. Probably obfuscated using Proguard.), some resource files and a “.so” files in the lib directory. How do I analyze the “.so” file. I know that SO files are, kind of DLLs of the Linux world but what are the tools that can be used to analyze SO files. Any links to videos would be very helpful. 🙂

Also, how would I get around if there were a JAR file instead of SO file in the APK?

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What are the tools use for reverse engineering android apk?

Currently, I only know about apktool.

But is there any tools that helps in checking the code, editing it and compiling it back to apk?

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What is step by step guide to reverse engineer the ordering system [on hold]

can u please elaborate step by step reverse engineering a software module
what I can think of –
start with DB schema then have the entities as classes ( POJO in Java) – then implement functionality one by one.

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Reverse engineer 4-bit CRC in LG IR packet

I am reverse engineering IR protocol of LG air conditioner. AC generally send the whole current state of remote on each key press. Data sent is 28 bits long, last 4 bits seem to be the checksum. I have already tried reveng, but without luck.

Bits 14-16 are mode of operation (heat/cool/fan/auto). Bits 17-20 are temperature + 15 degrees, bits 22-24 are fan speed and bits 25-28 seem to be 4-bit checksum.

Here are sample values:

100010000000100001000101 0001
100010000000100001010101 0010
100010000000100001100101 0011
100010000000100010000100 0100
100010000000100011000101 1001
100010000000100011010101 1010
100010000000100011110101 1100
100010000000000011000101 0001
100010001100000000000101 0001

In the last two, only the position of 11 changed, but checksum stayed the same. How is that checksum calculated?

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