I love to talk about alien life. I'm biologist and I can't help to find amusing how we evolved into our magical brain. I mean, mammals, birds and lizards are truly examples of how the brain is an awesome feature. That said, I was wondering on how little is the time humankind exist on Earth. Even if we stay here for 100 more centuries, it still looks like a very minimum piece of time. What if other civilization can't find each others because they are ephemeral? Even 4.3 trillion civilizations could exist in different lapses of time without the chance of coexisting. But, yeah, these are just thoughts of a pessimistic person hahahahaha.