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.
What Are Forever Stamps? Forever Stamps were created by the United States Postal ServiceÂ® (USPSÂ®) in 2007. They are non-denominational First ClassÂ® postage, which means that they can be used to mail First Class letters no matter what the postal rate. For example, in 2013 it cost $0.46 to mail a normal-sized letter weighing one ounce or less to an address within the United States. In 2014, the rate increased to $0.49.