Mass is how much stuff there is of something, how does something response to a specific force with Newton's second law.Weight is the force of gravity on a mass or on an object.The force of gravity between two objects is going to be a G which is F=G(m1*m2/r^2).F equals G(m1/r^2) which the "m1" is the mass of the earth, the "r" is the distance from the center to surface that we can get the g=9.8m/s^22. So the gravitional field of earth is 9.8 m/s^2.So the weight is the gravitional field of earth times the mass.The unit of mass is "kg", the unit of weight is the unit of gravitional field which is "m/s^2" times "kg".Then final unit of weight is kg*m/s^2 which is the unit of Newtons, force.If we take the new weight on the Moon which we can get the different gravitional field of Moon than on Earth. But we can still multiply the mass with the gravitional field of moon.Earth is not a perfect "ball", there is different weight in different places in the Earth.England and the United States have different units in weight and mass. The mass is "slug", and the weight is "pound".    

The gender discrimination.Heterosexual, Homosexual & Bisexual.Heterosexual is the instinct of biology which the human are same with nonhuman animal that heterosexual is trapping by the gender different, non pyschological instinct at all;Homosexual causes from the psychological trauma which is the specific event that turns its sexuality to same gender which is get out of the predicament of biology;Bisexual is the "after human", "out of biological instinct" which I think it is most strong mental power in human's mind, which only human can try to get out of biological instinct without the psychological trauma, without the mood conflict. Bisexual can cause by psychological truama, but can be not by it, too. It dependent by us.Problems of nonhuman animals which nonhuman animals don't have the "mood conflict" without psychological truama, but it can be trained by specific event by human's experiment.The different between the human which come from the ability of advanced, thinking, reasoning, reflecting.Self-consciousness also exist in the nonhuman animals' psychological structures.The strength of human and nonhuman animals' self-consciousness.The strength of nonhuman animals and the instincts of biology cause the nonhuman animals can't develop the cultures unnecessary. Most of the instincts of biology gone in the human, like the hungry becomes the delicious food, the sex becomes the pursue the happy.The genes and the environment, the nature and the nurture, the heredity and the experience.Congenital factors and acquired factors.There is high heritability of almost everything in twin even in different environment.Importance of effect of single mood in superego, like getting dinner with family better than drink alone, the children are just imitating their parents because that were first superego model has built in the life.Innate psychological tendencies is IMPORTANT!