You may also have to pay Microsoft's protection fee when you use Android.

I don't want a paradox. I want a radio.

If I keep receiving data with the message "resend at time t", I think it's worth it.

No, because if you keep doing it, eventually some future will hit YOUR timeline, and you get a message from a different future?

If I particularly want privacy, I won't fill the from address, or will fill it with false data.

Excuse my delay in answering.
I live in Ireland and am not a teacher. I know several.
School principles have a strong influence on a teachers career paths, and teachers who improve their students marks more will generally be assigned higher stream classes. Their accomplishment with these is a significant factor in their advancement to, for instance, a deputy principle post.

This isn't official advancement-based-on-results, but a truism of our educational system. YMMV, apparently.

While I agree with the tone of your post, teachers are being paid to do a job, and their students' performances effect a teacher's career.

Many students will go through periods of non-cooperation for very valid reasons, but the economic ramifications of allowing them to doss are potentially significant.
Maybe educational reform would allow students who have zero interest in public school eduction to engage in learning more suitable to their needs, but no one is currently incentivised to allow slackness.

People aren't going to calm down on having babies until they can be reasonably certain that they can maintain one or two through to adulthood.
Any natural controls, excluding a world-shaking disaster, aren't going to halt the population increase significantly, but making life good enough that the breeders have something better to do might slow it down for a while.

At least until evolution kicks in.

I certainly believe that people should be able to grow and consume coca and poppies, so long as they harm no other.

If they choose to refine that to a potentially dangerous substance and sell it, I agree that society needs to get involved. Similarly, I believe that you are within your rights to grow castor beans or curare, but should you use them harmfully or negligently, problems will arise.

I'm in a hackerspace.

I find the oscilloscopes, and multimeters useful. Include a solder iron, some prototyping board, hot glue gun, various screwdrivers, wrenches, bubble level, measuring tape, battery charger and some electricians pliers and you'll have a very useful space.

Also a bench with a vice and some helping hands.

Or an entire preserve of human-body bonobo-brained animals. You could charge admission.

Words on paper can be made secure because they're fucking worthless for replication and transfer.
They'd be even more secure if chipped into clay tablets in cuneiform.

Maybe, maybe.
I'm lucky enough to have found a dumpster with a full range of porn when I was a kid, but I worry for those who grow up thinking women look like the cartoons in Playboy. I had to get used to spots and scars and imperfect bodies; they're probably going to throw up when they get a real woman in bed.

Your glaring pearl whites may introduce priaprisms of envy?

Of many, many patents.
We'll see you in court, USSR!

If the building-owner realised that a significant percentage of the population would like to bomb said building, and accepted bomb-sized packages without security screening, yes; I would blame them.