Karl Marx's route and method in answering Core Questions of Hominology

Karl Marx is the first person raising five relative conclusions when exploring Human's Riddle,of which self-conciousness,thoughtfulness are the essence of human being and Human is the higher essence of human being;The characteristic of human being is the self-concious activity;The essence of human being is the summary of his social relationships;and What man needs is his essence.The contribution of Karl Marx for the solution to the riddle lies in the revolutionary breakthrough in methodology—from historical idealism to historical materialism.