Looking back at our years,

[SheilaT]

7. Sometimes, when someone says that the obvious

proof that time travel is never invented is that if it had been, we'd have lots of time travellers amongst us. I say, What if time travel isn't invented for a thousand, or five thousand, or even thirty thousand years? Time travellers might not be at all interested in visiting our particular time, or if they did they'd be paying attention to things that interest the from that distant future, and in a way that means we'd never notice they were here from the future.

I also have a hypothesis that Our Lady of Fatima was really a time traveller from the future with a time machine that didn't work very well.