I have learned that there are animals called potoroos and bilbies.

Yes, sherbet is the same thing for us Poms.

No, you can’t carry it, it’s too heavy

No, it doesn’t. Commands could be authenticated using a pre-shared secret. Even public cryptography existed prior to Voyager 1’s launch (by a year).

Based on the state of computer security at that time I would guess that’s unlikely, but then again it was the Cold War.

Anyway, just because it is possible it doesn’t mean anyone can do it.

Some infinities are bigger than others but those are both the same sized infinity, ℵ₀. Same if you multi-track drift.

Edit: I didn’t read it closely enough, it says “one person for every real number”. Which is indeed a larger infinity. However I don’t think you can diagram that, the diagram is showing a countable infinity of people on the lower track.

Killing one person for each real number, the train will be killing an uncountably infinite quantity of people in any given finite time slice.

The price difference is quickly made up for with the re-usability factor.

I don’t think that’s true, CD-Rs cost pennies. You have to rewrite every CD-RW 4 or 5 times before it’s comparable in price. In practice, across every CD-RW ever made, the approximate number of times it is written is probably about 0.5