Well known cover girl Cindy Crawford is pulling her kids out of their Malibu school because routine soil tests on the school grounds found elevated levels of a chemicals called PCBs in window caulking in the class rooms. PCBs were banned by Congress in 1976 after it was revealed they could cause cancer and harm the immune and reproductive systems. Over the years, schools have been instructed to remove the caulking around windows if the schools were constructed between 1950 and 1979. But some schools haven’t done it yet and so, during these routine tests, PCBs can sometimes be found. Read more.