 efficiency up until the 30s we had major iq reduction because of lack of iodine the u.s food supply especially in the u.s midwest from the 30s to the early 80s the government put crappy iodine in the salt by law and iqs went up 15 points on average burnt defects went way down in the early 80s they took it out again this is the deep earth crystal pure meaning atomic on the atomic table and it's