Laurie Rimon spotted a gleam while on a hike in northern Israel with several friends. It turned out to be a gold coin so unusual, Israeli archaeologists say there is only one other one with the same symbols in the world. "It's extremely exciting," said Dr. Donald Ariel, an expert with the Israel Antiquities Authority, in comments released by the agency, which says the coin was struck by Roman Emperor Trajan in the year 107. "His gold coins are extremely rare." One side of the gold disc shows an image of Augustus, the founder of the Roman Empire more than...