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Trial-and-error led to among the largest industries up to now.The creation of glass continually evolved with additions of limestone, lead oxide and boric acid.Metals like cobalt, copper, manganese, silver and gold would change the consistency, clarity, colour weight and strength of glass.The Venetians were the first ever to become world leaders in the manufacture of glass.The Crusades and the conquest of Constantinople in 1204 opened just how for extensive trade practices through the entire Eastern Mediterranean and in a variety of Islamic territories...

Have you ever wondered what the true 'secret' behind all magicians is? Why they're so attractive and keep making us 'envy' with they're awesome skill?Some magician could make helicopter disappear, some can cut women into two pieces and ensure it is back together, others can escape from coffin and etc.What are their secrets?Actually, the trick isn't so difficult to find, nonetheless it doesn't mean it's easy too...