Like the trailer, which soars with a sense of greatness, this is a beautiful film that stayed with me, and keeps recurring to my mind weeks later. No spoilers in this review, I'll just recommend the story to original thinkers who know how hard it is to stand against the crowd and state the truth, because it is the truth. And to keep faith with yourself--against the universe if need be.
If you are religious and worry that this story will attack your love of God, I don't think that will happen. If you believe that God created existence; then exploring this beauty cannot be a threat to God. If you hold no beliefs but rely on reason to understand the world around you, then you will revere Marcelino de Sautuola's courage, vision and unbending spirit.
I take away his story to stay with me as I walk through life.