My mother was having trouble trying to get a slide show on a DVD. For several minutes she kept taking the disk out, looking at it, and then putting it back in the computer. Finally she looked over at me and said, "It's not burning. The disk is still shiny."
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After my dad gets done browsing all the usual sites he checks, he clicks the back button until he gets to the original Google Firefox screen. He thinks it erases the information he has looked at and makes the computer run faster.