Able to "taste" chemicals to the level of parts per trillion, and only costing about 50 cents to produce, the tongue is going to be vital to food studies.

FORBES: Magazine Article

Fido can pick up the smell of TNTvapor at concentrations of just a few parts per trillion, and it was the first sensor to find buried mines at a level comparable to dog performance, with a false-alarm rate of less than 5%.

FORBES: A Nose For Bombs

That is 400 times the accepted limit in Holland, say scientists at a Dutch laboratory, the nearest facility that could test for dioxins and related chemicals. (The tainted fat was also found to contain 781 parts per trillion of dioxin - 1, 500 times higher than the Dutch safe level.) That was then.

CNN: THE GREAT DIOXIN SCARE