A childhood belief about church

I am one of those people who think they are always right. Well i have been a Christian, gone to church all my life, and went to a Christian School until recently. Well a year or two ago my mother and i were talking about an organ donation that a man had went through. (He had to give up one of his lungs.) Well i said, "Did he live?" My mom-of course-answered yes, and asked why he would have died. Well i had believed my whole life that when God made man, he took a lung out of him rather than a rib. My mom had to get her Bible out and prove to me that i was wrong.