The long life of toxins in the environment.

Came across this SFGate article over a study, in which toxins long banned - even before these mothers were themselves born - were found in the urine and blood samples of pregnant women.  Many toxins were in fact, found in 100% of the 268 women in the study.  Link to the analysis report here.

That's just downright scary.  'Splains a lot.