Toxic shock syndrome was a killer in its day. Now the EPA is warning of toxic caulk...in schools plus other buildings that nobody ever inspects. Why bad caulk? The old stuff off-gases PCBs. Chalk another one up for the petro-chemical industry that create poisons faster than any researcher or regulator can test them. Like lead mining, mercury from gold mining, asbestos, radioactive waste, dioxins, coal ash heaps, our old misdeeds just keep on giving.