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.
There's a new kind of Forever stamp on the market. The United States Postal Service released 10 new stamps. What makes these stamps unique, aside from their design, is the fact that they're a new kind of Forever stamp. No longer are you limited to a 1-ounce stamp. Now, there are Forever stamps that can be used for postcards, 2-ounce letters and 3-ounce letters.