A Tyrannosaurus rex fossil billed as one of the world's largest and most complete specimens was sold for a record $50.1 million Tuesday to a mystery bidder. NEW YORK — A Tyrannosaurus rex fossil billed as one of the world's largest and most complete specimens was sold for a record $50.1 million Tuesday to a mystery bidder. Sotheby's said the 67-million-year-old fossil, nicknamed "Gus," is now the most ex... [3633 chars]