What a let down.   After high hopes that a 90 year mystery would finally be solved, a team of U.S. researchers are leaving a remote island empty-handed after suspected ‘plane debris’ was, in fact,  a clump of trees   The expedition arrived at Nikumaroro in the South Pacific after years of research and a hope that the team had finally located Amelia Earhart’s plane.  Previous visits to the uninhabited island found signs of a castaway camp, a 1930s-era woman’s shoe and other evidence attributed to the celebrity aviator, including glass from a cosmetics freckle cream jar.  But for now, the mystery continues.