Marijuana permanently lowers IQ by several points in adolescents, according to research published in August. But a new study suggests that factors related to economic class and home life, not ...

IQ scores are on a decline, reversing a trend that saw scores rising at a steady rate during the 20th century, according to a new study. Researchers from the Ragnar Frisch Centre for Economic Research ...

SYDNEY (Reuters) - A landmark study suggesting a link between cannabis use and a drop in teenage IQ may not have gone far enough in its research, with any falls in IQ more likely due to lower ...

The study found that people born in the 1960s and 1970s, when lead gas consumption was booming, may have lost up to seven IQ points at worst Stephanie Wenger is a TV Writer/Reporter at PEOPLE. She ...

Communities started adding fluoride to the water supply in 1945. But now, a new analysis finding a potential link between added fluoride and lower IQs in children is causing concern. The National ...