I am a retired research scientist. I've spent my time learning and applying that info. The more one learns, the more they realize how little they know. It is called the Dunning-Krueger effect. I believe in reincarnation; we are all recycled star dust from the Big Bang ~13.7 billion years ago. Is there heaven? That is a belief in which there is no concrete proof either way. What comes after? One can wax philosophical, but I hope that if heaven exists that they have dark chocolate there.