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131National Christmas Tree (United States) — This article is about the Christmas Tree placed on the Ellipse near the White House. For the Christmas Tree placed inside the White House, see White House Christmas tree. For for the giant Sequoia known as the Nation s Christmas Tree , see… …
132History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …
