At the age of 40 in 610 CE, Muhammad is said to have received his first verbal revelation in the cave called Hira, which was the beginning of the descent of the Quran that continued up to the end of his life; and Muslims hold that Muhammad was asked by God to preach the oneness of God in order to stamp out idolatry,
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3) The drafting of a new constitution
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Though the first actual helicopter wasn’t built until the 1940s, it is believed that Leonardo da Vinci’s sketches from the late fifteenth century were the predecessor to the modern day flying machine. As with many of da Vinci’s ideas, he never actually built and tested it – but his notes and drawings mapped out exactly how the device would operate.
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<span>Chisels and gouges, often
made stones such as jadeite, diorite, or schist, all harder than flint.</span><span />
