When I was about fourteen , my older brother lifted my hand and let it drop , he did this twice . He told me that although I can ' t see it there is an invisible force called gravity and it is literally pushing my hand downwards . He told me to try and see it this time , he did it again . At that moment , I contemplated the complexity of what he was saying and felt this presence of gravity pushing my hand . It was no longer just a subconscious awareness that gravity exists . I knew what gravity was but never thought of it as actually being here and all around me . Anyway . That started my path into reading nonfictions , studying our planet and it ' s inhabitants , and even spiritually it opened my mind to the possibility of believing or nonbelieving but having a choice other than what my parents believed . It was a small moment but it meant a lot to me .