Ok, this law states that matter can not be created nor destroyed. How does that explain when a person is born? New cells are produced, new chemicals and molecules are created to help the body sustain life. That shows that matter can be created, thus proving that theory wrong. Now, I'm sure that top professors didn't overlook this aspect, but it does seem strange. This is what my friend says: "The food that the mother eats is rearranged with virtually the same processes as rearranging to produce energy for a full-grown person." What do you think, Conversatron?