Perfluorinated Polar Bears!
No, this is not an exasperated exclamation by Captain Haddock, but might well be a shout of surprise at learning that Canadians have been searching for compounds of that nature in these snowy animals. But why should Scott Mabury and his group at the University of Toronto be looking for them?
The simple answer is that they are terribly persistent in the environment. Bit odd, one might link, considering that
Fluorine is the most reactive of all the elements in the periodic table. So reactive[1], in fact, that