Arguably studies leading to the discovery that lead is damaging to intelligence is indeed one of those studies. In fact, there is a whole ton of research also

Arguably studies leading to the discovery that lead is damaging to intelligence is indeed one of those studies. In fact, there is a whole ton of research also on google scholar: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C14&q=how+to+increase+iq&btnG= https://scholar.google.com/scholar?hl=en&as_sdt=0%2C14&q=how...