More than 5 billion crayons are produced each year. More than 100 billion crayons have been produced so far. The first crayons consisted of a mixture of charcoal and oil. In the early 1900s, cousins Edwin Binney and Harold Smith developed a nontoxic wax crayon. Their first box of Crayola crayons were sold for a nickel in 1903.

The first credit card was issued in 1951. Credit was first used in Assyria, Babylon and Egypt 3000 years ago. The bill of exchange - the forerunner of banknotes - was established in the 14th century. Debts were settled by one-third cash and two-thirds bill of exchange. Paper money followed only in the 17th century. The first advertisement for credit was placed in 1730 by Christopher Thornton, who offered furniture that could be paid off weekly.