Do you ever mail a letter and wonder what happens to it after you drop it in the box? Read all about the post office and learn how letters are weighed, sorted, transported, culled, canceled, coded, bi
?Before the zoo opens each day a small army of keepers, vendors, and maintenance workers perform the daily tasks of cleaning and setting up. Then the crowds flock in. . . . The busy pictures are fille
A rotting hull of a ship...lost gold...coins...gems...Sunken Treasure!Today treasure hunting is a big business. Searchers use metal detectors and sonar to locate treasure on the ocean floor. Divers us
The alarm sounds. Fire! Fire! Big trucks roll out of the firehouse and race to the scene. Out come the soft hoses and aerial ladders. Whether the fire is in the city or in the country, on the waterfro
