1 Although any individual may develop a case of pinworms, the infection occurs most frequently in school children between 5 to 10 years of age.  Pinworm infections occur in all socioeconomic groups; however, human-to-human spread is favored by close, crowded living conditions. Spread among family members is common.
Before they start collecting, stamp collectors try to identify the types of stamps. These will help them segregate and sort stamps according to their classification. On its basic concept, there are three main classifications of stamps â special, commemorative, and definitive.
âWhy the USPS Forever stamps aren't living up to their name. A short while ago, it seemed the U.S. Postal Service was hiking the price of postage stamps every year. That drove consumers to snap up Forever stamps, which are non-denominational and can be used even when stamp prices rise.