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

"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

LighterLife argues that its foodpacks comply with the United Kingdom's National Institute for Clinical Excellence and contain at least 100 percent of the recommended daily allowance of vitamins, minerals and trace elements.

CNN: Extreme diets: Life on 800 calories a day

Yet at hot springs and thermal spas where radon typically is found in the air or water along with carbon dioxide, sulphur gases and trace elements of other minerals, health-seekers sing its praises.

FORBES: Magazine Article

As he puts it, a cubic metre of regolith contains, besides the necessary oxygen, enough hydrogen, carbon, nitrogen, potassium and other trace elements to make two cheese sandwiches on rye, two colas and two large plums.

ECONOMIST: Spaceflight

Dr. SCHAWINSKI: So, in the very early universe, most of the elements that were made in the Big Bang were hydrogen and helium, and very few trace elements of heavier elements, like oxygen and iron and so forth.

NPR: What Makes Our Solar System Special?

Duke Energy spokeswoman Rita Sipe said Duke Energy had detected trace radioactive elements, likely to have originated from Japan's Fukushima plant, in North Carolina and South Carolina -- but at a level "far below" reporting requirements.

CNN: Japan's nuclear contamination spreads to more U.S. states