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Everything in life is memory, save for the thin edge of the present (Gazzaniga, 2000)
Definition: Memory is the processes involved in retaining, retrieving, and using information about stimuli, images, events, ideas, and skills after the original information is no longer present. => Mental ‘time travel’ …
The Galileo Story There is an interesting story about the telescope. In Holland, a man named Lippershey was an eyeglass maker. One day his children were playing with some lenses. They discovered that things seemed very close if two lenses were about a foot apart. Lippershey began experiments and his "spyglass" attracted much attention. He sent a letter about it to Galileo, the great Italian scientist.  Galileo at once realized the importance of the discovery, and set out to build an instrument of his own. He used an old organ pipe with one lens curved out and the other curved in. On the first clear night he pointed the glass towards the sky. He was amazed to find the empty dark spaces filled with brightly gleaming stars!  Night after night Galileo climbed to a high tower, sweeping the sky with his telescope. One night he saw Jupiter, and to his great surprise discovered with it three bright stars, two to the east and one to the west. On the next night, however, all were to the west. A few nights later there were four little stars .