The smartest Jews seem to be a blend of Jewish/German brain architecture. For some reason Germany has been a hot bed of envy. They have special words for various forms of it such as gluckschmerz, sadness at another's good fortune, and schadenfreude, the opposite. Germans mounted "envy heads" outside their doors, monster heads meant to scare away the envious. Envy leads to tribal warfare which leads to IQ boost. The pride to envy to hate to murder process is the special evolutionary pressure that led humans to develop IQ far in excess of that needed to find food and shelter, an unusual pressure in that it leaves all other plants and animals largely untouched. Another property of this special pressure is it is finely regulated at a precise level to not increase the IQ challenge too fast.
Evolution is really a two step process: 1) something must develop something new, and 2) something else must die. Everyone seems to only remember step 1.
let me see if I can dig up the statistics