A "supertaster" is someone who tastes things more intensely than most individuals. NPR's Robert Siegel talks to Dr. Linda Bartoshuk of Yale University. Supertasters are especially sensitive to a chemical, and they have more taste buds than other individuals. One can test for the relative number of taste buds by swabbing the tongue with blue food coloring, then examining the surface with a magnifying glass and flashlight. Tongues of supertasters will appear almost as if they are covered in "pink tiles," says Bartoshuk, while tongues appearing with blue and pink polka dots are what she calls "non-tasters."