Better start saving: The price of a one-day ticket to Walt Disney World's Magic Kingdom is now $99. That's a $4 increase from the previous price hike announced in June 2013. The price hike went into effect Sunday.
Probably of Babylonian origin, an abacus is a calculating instrument that uses beads that slide along a series of wires or rods set in a frame to represent the decimal places. It is the ancestor of the modern digital calculator.
It is possible that it derives from the earlier counting board s used around the Mediterranean as early as 300 B. C. An Aztec version of an abacus, circa 900-1000 A.D., is made from maize (corn) threaded through strings mounted in a wooden frame.