One is probably link local the other is global, that’s pretty normal. https://en.wikipedia.org/wiki/IPv6_address#Address_Scopes

Sadly very typical for science journalists.

The design is very human.

Yeah so I’ve struggled with warping too and for me by far the best bang for the buck was alcohol. I’ve never tried glue or hairspray or any actual adhesives.

Have you cleaned the bed with alcohol or a similar solvent before printing?

xmpp is closer to IRC than to modern communications protocols. End-to-end encryption, for example, is an optional protocol extension, which hasn’t even been formally finalized yet (and probably won’t ever be, given it’s been 10 years now)