Bells make a happy sound. Jingle! Jingle! Jingle! Long ago, people thought that bells scared evil spirits away. Today at Christmas, bells are part of celebrations. Bells are part of Christmas carols. Jingle Bells is a favorite holiday song. It was written in 1857. This popular song was even played in space. It was part of a Christmas joke. The astronauts aboard the Gemini 6A spaceflight played the joke. It was in 1965. They tricked the staff at Mission Control. At first, the two .....