Lead was taken out of gasolene under the authority of the e p a, under the clean air act in the early 19 seventies. John Sutter: It doesn't make sense to look for a single explanation for a declinin crime. There could be many things going on," he says. "It's really hard for a lay person to watch a scientific debate"
As the Supreme Court considers overturning Roe v. Wade, we look back at Steve Levitt’s controversial research on an unintended consequence of the 1973 ruling.