In 1700s, the deer skin was a common medium of exchange between the trading settlers and the native Red Indians in America. This is how a buck became a slang for a dollar.
28
There are two credit cards for every person in the United States.
2

The US national public health institute, Centers for Disease Control and Prevention, has an actual plan in case of zombie invasion.
29
According to a 2014 study, 1 in 10 Americans think HTML is a sexually-transmitted disease.
8
Harvard earns enough money from interest on its endowment that it could offer free tuition to every student and still profit.
13


