It's The End Of The World!!!!!! There have been billions of humans in this world. Most of them are alive today; six billion, whereas in 1960 there were half that, and even fewer before then. Less than one in a million were among the first thousand, as an example. We modern humans are very common, I suppose about half of all humans ever born are alive today. So it's no mystery that we in particular are alive right now. But it would be truly surprising, if we were among the first thousands - it would be like winning a lottery! However, if there were many humans to be born in the future, then there'd be more of them (all added together) then of us and all our predecesors. In which case, there'd be relatively few of us. Say the human population goes up to 10 trillion and stays there for a hundred millenia; then less than 0.0001% of all humans would be born by now! It'd be incredibly unlikely for us to be here now! Since this is so extremely unlikely, it is very probably true that the end of the world is at hand.