"I suppose if you lay in a bath filled with mineral salts and trace elements some small part of that will be absorbed through your skin, " he says.

FORBES: Water, Water Everywhere

Even if the trace elements of PCBs that can be found in Hudson River fish posed a danger to humans, the EPA's solution is ill-conceived.

FORBES: Fact and Comment

They are concentrating on a study of stable isotopes - atoms of the same type but with different masses - and trace elements in the birds' feathers.

BBC: Feathers clue to warbler's travels