Simon Fraser University Associate Professor Dr. Dongya Yang holds a letter written by Amelia Earhart to a family member as he poses for a photograph at the University in Burnaby, B.C., on Wednesday. More than seven decades after aviator Amelia Earhart disappeared while attempting her ill-fated flight around the world, a British Columbia scientist hopes to extract DNA from dried saliva on two envelopes containing letters she is believed to have sealed.