If you were transported 400 years into the past with no clothes or anything else, how would you prove that you were from the future?
I agree with Chad that simpler is better. And trying to remember specific dates of someone's death or something like that is, is much more challenging because you don't know maybe the precise time point in time and eso I think, more important would be again a simple invention, something that that's easily demonstrate herbal. Maybe the telephone is is a great one. If you've ever put the string between two cups and been ableto talk through that, you know, easy to set up with any materials available and could demonstrate, uh, the use case for that, I think that's that's a good starting point.