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.
The calculators that we use today are the advanced versions of a device that, when invented, was in its primitive form and was called the adding machine. Abacus. THE abacus wasnât a machine but a tool used for counting that was invented before 2000BC. Considered the basis on which the modern calculator has taken its shape, an abacus consisted of small ball-shaped beads that slid on sticks and the sticks were attached to a rectangular frame.