Some very interesting ideas there. Though if I had to guess, it would be that it was declassified as a planets because they were finally able to properly measure its size. Before then they didn't realise it was so small. To put it in perspective, if there was a race between a man running from...
Well as a Christian I believe that one day Jesus's is gonna come back and leave those he doesn't take to heaven in a fiery eternal hell. Which is probably closest to number 2 XD
While the discovery of milk could entirely be because of curiosity. I suspect it could also be explained by witnessing a calf drinking from its mother's udder, then a human making the connection to humans breastfeeding their children.
As for teleportation, I'd say it's less likely. The science...
I suppose I hadn't considered that. It might be possible in the future, though I don't know if any money would be spent to research such a thing. Outside of people who a of the furry community, I don't see it having too much of a need.
Buy flying cars are more likely to exist at some point in...
Depends what you mean by change. If you mean physically, then I doubt we'll change that much; if at all. But if you mean in a sociologal way, then most definitely. We can already seen in modern times that humans ate changing in that way.