By and Carol ThompsonUPDATE:CHICAGO (CBS) -- For nearly 20 years, Marilyn Hartman baffled everyone. In a post-9/11 world, she flew the world over, she never had a ticket. She became America's Serial Stowaway.The one thing she hasn't done since her latest successful overseas flight, is talk about it – in depth. How? Why? Will she do it again?She had an all-encompassing interview exclusively with CBS 2 Investigator Brad Edwards.Marilyn Hartman reflected on the moniker she's best known for: ."I don't mind if people say 'She's a nut.'""... because when I look at it objectively … ""… that's...…By and Carol ThompsonUPDATE:CHICAGO (CBS) -- For nearly 20 years, Marilyn Hartman baffled everyone. In a post-9/11 world, she flew the world over, she never had a ticket. She became America's Serial Stowaway.The one thing she hasn't done since her latest successful overseas flight, is talk about it – in depth. How? Why? Will she do it again?She had an all-encompassing interview exclusively with CBS 2 Investigator Brad Edwards.Marilyn Hartman reflected on the moniker she's best known for: ."I don't mind if people say 'She's a nut.'""... because when I look at it objectively … ""… that's...WW…