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Asbestos is a naturally occurring silicate mineral with long, thin fibrous crystals. The word asbestos (?sßest??) is derived from a Greek adjective meaning inextinguishable. The Greeks termed asbestos the miracle mineral because of its soft and pliant properties, as well as its ability to withstand heat.

Asbestos is known to have toxicity. The inhalation of toxic asbestos fibers can cause serious illnesses, including malignant mesothelioma, lung cancer, and asbestosis (also called pneumoconiosis). Since the mid 1980s, many uses of asbestos have been banned in several countries.

Asbestos became increasingly popular among manufacturers and builders in the late 19th century due to its resistance to heat, electricity and chemical damage, its sound absorption and tensile strength. When asbestos is used for its resistance to fire or heat, the fibers are often mixed with cement or woven into fabric or mats. Asbestos was used in some products for its heat resistance, and in the past was used on electric oven and hotplate wiring for its electrical insulation at elevated temperature, and in buildings for its flame-retardant and insulating properties, tensile strength, flexibility, and resistance to chemicals.

Source: Wikipedia





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Heron of Alexandria created the earliest known automatic door in the 1st century AD during the era of Roman Egypt. The first foot-sensor-activated automatic door was made in China during the reign of Emperor Yang of Sui (r. 604, C618), who had one installed for his royal library. The first automatic gate operators were later created in 1206 by the Arabic inventor, Al-Jazar

Source: Wikipedia





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"As a construction material, wood is 4 times more efficient as an insulator than an equivalent thickness of cinder block, 6 times more efficient than brick, 15 times more efficient than concrete, 306 times more efficient than steel, and 1,770 times more efficient than aluminum."

Source: Oregon State University Wood Science and Engineering Department





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There are a number of claims to the inventor of the pile driver. A mechanically sound drawing of a pile driver appeared as early as 1475 in Francesco di Giorgio Martini's treatise Trattato di Architectura. Also, several other prominent inventors James Nasmyth, watchmaker Sebastiaan Valouè, Count Giovan Battista Gazzola, and Leonardo da Vinci  have all been credited with inventing the device. However, there is evidence that a comparable device was used in the construction of Crannogs at Oakbank and Loch Tay in Scotland as early as 5000 years ago. Otis Tufts is credited with inventing the steam pile driver in the United States.

Source: Wikipedia





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"More concrete is used than any other man-made material in the world. As of 2006, about 7 cubic kilometers of concrete are made each year more than one cubic meter for every person on Earth...More than 55,000 miles of highways in America are paved with this material."

Source: Wikipedia




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