If you are what you eat, doesn't that unavoidably make you a cannibal? If lighter colours absorb less light than darker colours, why do white people come from colder, darker parts of the Earth than black people? Likewise, if the solar maximum is near green, why do plants reflect green light and absorb the rest? Wouldn't they be better off absorbing more energy for photosynthesis? When a neutron star is formed by a collapsing star, do any protons survive? If so, does each neutron star become its own isotope/element?