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In recent years the last 4 miles have become rather rough due to lack of maintenance, especially either side of Escavada Wash, and may be impassable after rain, but any vehicle driven with care can usually reach the park.Road 7950 descends into a shallow canyon (Gallo Wash) becoming paved at the park boundary, passes the campground and a few small ruins then enters a deeper valley up to one mile wide.The clay subsequently hardened in the Sun or was baked to form permanent tablets. For the first time news and ideas could be carried to distant places without having to rely on a messenger's memory and integrity.Hieroglyphic script evolved slightly later in Egypt. found in a temple at Erech in Mesopotamia show a chariot with solid wooden wheels."Either you do the work or you get the credit" Yakov Zel'dovich - Russian Astrophysicist Fortunately it is not always true.Background We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.The calendar adopted by the Sumerians, Babylonians and Assyrians was based 12 lunar months and seven-day weeks with 24-hour days.Since the average lunar month is 29.5 days, over 12 months this would produce a total of only 354 days as against a solar year of 365.25 days.

They did not have the benefit of cheap, off the shelf, mass produced batteries. Bronze is a relatively hard alloy of copper and tin, better suited for the purpose than the much softer copper enabling improved durability of the weapons and the ability to hold a cutting edge.There is one other way into the park from the south, along sandy road 57 that runs quite straight through more empty, wide-open desert land for 19 miles to the next paved highway, Indian Route 9.This is less maintained that the northern approach, bumpy in places but still generally quite good, though not advisable during wet weather when the surface becomes too muddy.Only a few low gorges and mesas interrupt the general flatness, and the prevailing aridity plus the long winters experienced by this relatively high location (6,200 feet) make this an odd place for what was a large and advanced civilization to develop.But for 300 years the Anasazi Chacoan villages - most based on a single walled enclosure with hundreds of inter-linked rooms known as a great house, were at the center of a network of roads and outlying settlements that extended 100 miles to the south, west and north, and include a few others also well preserved today like Aztec Ruins near Farmington.

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