The disappearance of America's famous aviatrix Amelia Earhart is one of the most enduring mysteries of the 20th century. But investigators could finally be a step closer to solving what happened to the female pioneer, after new, hidden clues were unearthed on a key piece of evidence.Scientific analysis shared with MailOnline revealed the letters and numbers 'D24', 'XRO' and either '335' or '385' etched on an aluminium panel which washed up on a remote island close to where Earhart's plane went missing.
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