The Ups and Down of Yo-yos

The yo-yo in its simplest form is an object consisting of an axle connected to two disks, and a length of string looped around the axle, similar to a slender pool. It is played by holding the free end of the string known as the handle allowing gravity or the force of a thrown to spin the yo-yo and unwind the string then allowing the yo-yo to win itself back to one`s hand, exploiting its spin. This is often called  ``yo-yoing``.  Yo-yoing remains a popular past time of many generations and cultures. One of the most basic tricks is called the sleeper, where the yo-yo spins at the end of the string for a noticeable amount of time before returning to the hand. Many yo-yo tricks are done where the yo-yo is said to be sleeping. One of the most famous tricks on the yo-yo is ``walk the dog``. This is done by throwing a strong sleeper and allowing the yo-yo to roll across the floor, before tugging it back to the hand.