T. rex could become most expensive fossil ever - but it's a ​problem for scientists

A 67 million-year-old Tyrannosaurus rex will go on sale in New York with a pre-sale value of $30m.A 67 million-year-old Tyrannosaurus rex will go on sale in New York with a pre-sale value of $30m.A 67 million-year-old Tyrannosaurus rex will go on sale in New York with a pre-sale value of $30m.