LogFAQs > #974713900

There was some Doctor who did a study on our brains, and the fact that unlike almost all other animals we think about the "long-term" future, at all times. Some birds (ravens) can apparently plan for the "future", or seem to (although just like migratory birds' "zugunruhe", and ants' seemingly high complex behaviors -- this may be a "false friend", and instead be instinctal), but this is not the long-term future. For example in humans often children (after the age of 6 or 7), when they begin to think about the future, will become melancholy when they realize their own parents are not there.
We don't see this behavior in any other animal, that we know of.

Which means our brains cannot "think" about a world where we are not, therefore an "afterlife" of some kind is the only thing they can think about.