With almost everyones backups stored in plain-text, making it all a little silly.

Think about it for a second: you can re-establish your WA account on a new device using only the SIM card from your old device. SIM cards don't have a storage area for random applications' encryption keys, and even if they did, a SIM card cannot count as "end-to-end" anymore. Same goes for whatever mobile cloud platform those backups might be stored on. And you'd hope Apple or Google aren't happily sending off your cloud decryption keys to any app that wants them. Though maybe they are?

Reestablishing your WhatsApp account on a new device doesn't give access to your old chat messages, you need to restore a WhatsApp backup for that. The backup doesn't need to be stored in the cloud, you can choose to create a local file and manually transfer that to your new device.

In any case, as soon as you start using WhatsApp on a new device, users in the chats you participate in will receive a message informing them that your encryption keys have changed.

Understanding basic boolean logic isn't just fundamental to programming, it's a particularly easy component that's usually taught very early, for both reasons.

It takes one table to explain XOR and it's the first one on the page. In ASCII:

  a | b | a XOR b
  --+---+---------
  0 | 0 |    0
  0 | 1 |    1
  1 | 0 |    1
  1 | 1 |    0

If a "programmer" seeing that still can't read code using a XOR, I'd fire them.

This is good, I definitely had fun! Really cool original idea! I liked how I discovered the "vertical line" win by accident when I thought I was going to lose. (I didn't quite get the instructions at first, but it made sense when playing.)

A couple of issues I noticed:

- some pieces rotate in an odd way, as if around an off-centre fixed point. It felt unlike regular Tetris and caused losses that otherwise wouldn't have been in tight spots. Like the piece would "jump" over an entire grid section unexpectedly. It's especially noticable with the long piece.

- on my system, trying a "hard mode" game after a few normal mode games, the hard mode immediately began insanely fast. Repeat plays then caused it to keep speeding up even further each restart, eventually going into endless loop by itself, where it seemed to be so fast it couldn't correctly check gamestate. In these restarts, no pieces would appear, but the score kept increasing anyway, eventually up to some very high number (eg, >70,000) before it'd finally decide a game over state. Each successive game would do the same thing, but advance to yet higher scores.

EDIT: Reproduced the second issue, and noticed hundreds of "Skipping tick during rotation" messages in the console. The procedure for me to reproduce was: play a normal game until you hit the 6000-7000 huge speed-up and game over, then keep playing hard mode games repeatedly, until it takes over.

Not wrong, but something I found confusing, in section 2.7.5 (page 11 of PDF):

"Let's say you modified foo.txt but didn't add it. You could: <git command>"

Followed by:

"And that would add it and make the commit. You can only do this with files you added before."

Wait, what? So, I modified foo.txt but didn't add it, and then the command to add and commit at the same time can only be done with files I did add before?

Guide was working great to heal years of git trauma up until that point though!

Notably, there was no attempt to operate the watch at such depths. Pressing a side button would be an interesting test, for instance. Many "water resistant" watches, rated to a certain depth are only rated so, given the not inconsiderable caveat of not being able to operated - just looked at. The higher end, more expensive models claiming full waterproof ability don't typically have such functional restriction.

It seems like actually pressing a watch button at that depth would be quite a feat of precision engineering itself. Are ROV arms typically that precise that it would be possible to see well enough and finely enough control the arm to press the button?

Not sure if the buttons function, but the watch is displaying time in the photos, for 50 minutes of the descent at least.

I would guess by reflecting light off something silvery, eg, a wall painted in metallic silver paint.

That's not how colored light actually works. (That's the joke!)

There isn't a silver "color" of light, it's a visual phenomenon that warps and reflects the color of the environment around it.

So unfortunately there are no silver colored light bulbs (except for using a silver coating to block or reflect the light).

Maybe it's that shiny reflective things like disco balls are therapeutic, imparting modernity, sophistication, intuition, reflection, coldness, or disco fever.