Related to the #4, I recommend the book Roadside Picnic by Arkady Strugatsky.

“What if we finally got visited by aliens but the most important event in or history was simply an intergalactic roadside picnic for the aliens?

They don’t even bother with us ants. They just pull over have some fun for a couple of hours and leave a mess behind…”

Oh, man. You have no idea how long my to-read book list is. But I just added this to it.

Thanks. Haha.