Money supply. In economics, the money supply (or money stock) is the total amount of monetary assets available in an economy at a specific time. There are several ways to define money, but standard measures usually include currency in circulation and demand deposits (depositors' easily accessed assets on the books of financial institutions).
Smallpox (Variola). Smallpox last appeared in Australia in 1938, and the last case naturally occurring cases in the world was reported from Somalia in 1977. The virus is now only held officially in two secure laboratories.
Powdery mildew. A powdery mildew disease on poinsettias was first seen in Mexico and Puerto Rico in the late 1980s, and in Pennsylvania and the Pacific Northwest in 1990. Over a hundred growers across the U.S. were affected by powdery mildew in 1992 (16).