In fact, there are more than 1 billion colds in the United States every year, according to the National Institutes of Health. And those facts change as scientists learn more about how colds work. Some people swear by zinc as a means of shortening a cold's duration, but research on that subject has been spotty.
The hard clam (Mercenaria mercenaria), also known as a quahog (or quahaug), round clam, or hard-shell (or hard-shelled) clam, is an edible marine bivalve mollusk that is native to the eastern shores of North America and Central America, from Prince Edward Island to the Yucatan YucatÃ¡n. peninsulaonfusingly, the ocean quahog is a different species, Arctica islandica, which, although superficially similar in shape, is in a different family of bivalves: it is rounder than the hard clam, usually has black periostracum, and there is no pallial sinus in the interior of the shell. Contents.
1 Hard clams, also commonly called Quahog, were of great cultural significance to the Native Americans of Southern New England. 2  Native Americans cut beads from the inside of their shells for use in their art work. 3  The beads were also used as currency, called wampum.arvesting Hard Clams. The hard clam is a commercially important species that is harvested both by commercial fishermen (baymen) or by the recreational clammer. Hard clams are classified by size for the food market. The smallest size is the littleneck clam, followed by topnecks, cherrystones and chowders.