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.
Have a play with this one: Every column represents a different digit, such as Units, Tens, Hundreds, etc. The abacus has been around for thousands of years, and is still used in some parts of the world. Sometimes blind people will use an abacus, because they can feel the numbers easily.