Seesaw development in Appalachia. 'Hickey-horse' in the coastal regions of North Carolina is consistent with other linguistic and ethnic variations." Seesaw A seesaw (also known as a teeter-totter or teeterboard) is a long, narrow board supported by a single pivot point, most commonly located at the midpoint between both ends; as one end goes up, the other goes down. Mechanically, a seesaw is a lever which, like all levers, consists of a beam and fulcrum. The most common playground design of seesaw features a board balanced in the center. A person sits on each end, and they take turns pushing their
Time synchronization in North America Time synchronization in North America Time synchronization in North America can be achieved with many different methods, some of which require only a telephone, while others require expensive, sensitive, and rare electronic equipment. In the United States, the United States Naval Observatory provides the Standard of Time, called UTC(USNO), for the United States military and the Global Positioning System, while the National Institute of Standards and Technology provides the Standard of Time for civil purposes in the United States, called UTC(NIST). A Standard frequency and time signal service is a station that operates on or immediately adjacent to 2.5 MHz,