Reason

i think that we always want to know more about life, always want to answers the questions, and learn more about life.
But we will never have questions about something that we don't know or we don't know that exist. Because we don't know that.. "that thing" exist. We never can question about something that we don't have a minimum idea that "that thing" exist! We just can have Curious about something that we know or at least have a minimum idea of what its all about, Because we have seen it at least one time, or maybe other people talks about it, or say it to us.
Other things i know about it because i have studied at least one time in our lives, for example in geography, in Spanish. But how i know that everything that i know it's truth? i think that everything can make us have at least a little doubt.
i Think that everyone have their own truth or their own knowledge that its based in experiences, and something like that.
And i think that the truth and the reality can change depending of everyone, because we are not sure at all about the things, or about what happen around us, in our environment.