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Antarctica is "a place where we come to determine the health of the world."
ABC News' James Longman reports on scientists' conservation efforts.
Though John Giuca has maintained his innocence, he was found guilty of the murder of 19-year-old Mark Fisher after a house party Giuca hosted in 2003.
Giuca's sentence was overturned after a court found the prosecutor withheld information from the defense.
In 2008, a teacher survived a three week disappearance in New York that she had no memory of. She vanished again in the U.S. Virgin Islands 9 years later - and never came home.