Seesaw a "teeter-totter". According to linguist Peter Trudgill, the term originates from the Nordic language word "tittermatorter". A "teeter-totter" may also refer to a two-person swing on a swing seat, on which two children sit facing each other and the teeter-totter swings back and forth in a pendulum motion. Both "teeter-totter" (from "teeter", as in "to teeter on the edge") and "seesaw" (from the verb "saw") demonstrate the linguistic process called reduplication, where a word or syllable is doubled, often with a different vowel. Reduplication is typical of words that indicate repeated activity, such as riding up and down on a
North America of the last glacial period, in what is known as the late glacial maximum, occurring around 13,000 years ago. The oldest petroglyphs in North America date from 15,000 to 10,000 years before present, but some South American rock painting dates to 36,000 to 25,000 years ago (with the more recent dating being favored). Genetic research and anthropology indicate additional waves of migration from Asia via the Bering Strait during the Early-Middle Holocene. Before contact with Europeans, the natives of North America were divided into many different polities, from small bands of a few families to large empires. They lived in