The document summarizes the origins of several inventions including the compact disc, mobile telephone, battery, hot dogs, and pretzels. The compact disc was created in 1979 and allowed storing up to 700mb of data. Mobile telephones were developed during World War 2 for long-distance communication and continued improving until 1985. Batteries were first invented by an Italian physicist in the 18th century. Hot dogs were first sold by a German butcher in New York in 1867. Pretzels were created in Germany in 1190 originally to reward children for doing homework.