But why do we have this desire and need to know the impossible answers about life?
This is my take on it.
We are an instinctively inquisitive species. We are not born knowing what is good/bad to eat, we have to learn it from our parents and culture. Knowledge of what is edible/poisonous can only have come from being inquisitive and experimenting in the distant past.
As we discovered more and more things about ourselves and the environment, it was only natural that curiosity about everything took over.
Unfortunately, many of our forbears who couldn't find out the real answers to natural phenomena were prompted to invent answers in the form of spirits and gods.
May I add a further reason?
We are the only species to have developed a completely open-ended and infinitely variable communication system. We are the only species ever able to enquire of other members of our species matters which are abstract and hypothetical. And to add to that, by means of written language, we are able to know of the thoughts, actions and conclusions of people we will never meet and who may seperated from us not just by distance but by time.
We have the capability to ask the questions.
In some cases, communications from past-times are treated as authoritative
just because they are old and more relevent, contempory, information is rejected.
Consider the RC Church's attitude toward sex and sexuality. Much of it comes from ancient Greece, via Thomas Aquinas. Modern understanding - empirical in origin - is rejected in favour of Natural Law.