> I have experimental evidence that time travel is not possible. I gave a party for time-travelers, but I didn't send out the invitations until after the party.

> I have experimental evidence that time travel is not possible. I gave a party for time-travelers, but I didn't send out the invitations until after the party. I sat there a long time, but no one came. Why would one need to send invitations if the outcome is already known once the party is over? It seems that merely giving a party for time-travelers is a plenty sufficient evidence. > Another frightening possibility is intelligent life is not only common, but that it destroys itself when it reaches a stage of advanced technology. Or that it transcends beyond physical 3D realm (as corny as it sounds) and so it's no longer detectable from within it.