What characteristics of someone appearing like this would make him or her (or it or them) believeable? How could you "prove" you actually arrived from The Future?
A sort of corollary: what characteristics would some artifact have to exhibit to allow one to consider it "alien", the product of a non-human intelligence?
I was thinking about this when I read the article. I found myself thinking that you'd have to present convincing evidence that you were from the future in such a way that you didn't change history - but then I realized that the whole purpose of the time travel would be to change history, so maybe that wouldn't be a limiting condition.
Maybe the time traveler could present a working ray gun?
What characteristics of someone appearing like this would make him or her (or it or them) believeable? How could you "prove" you actually arrived from The Future?
A sort of corollary: what characteristics would some artifact have to exhibit to allow one to consider it "alien", the product of a non-human intelligence?