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Outside of aaron's home when his phone buzzed. it was an e-mail. >> what was chilling was the e-mail came with an audio file. >> my name is denise huskins. >> reporter: the woman on the recording said she was denise. this very strange tale was about to get much stranger. >> what had happened to denise? was she still alive? or was this all an elaborate hoax? coming up -- >> we don't know where denise huskins is. >> that scriptic recording. what kind of message was it? >> she sounded calm. not terrified. not distressed at all. >> not someone in fear for her life. >> as if she was talking to so...

Journalism class. then the opportunity came up to go to death row and interview hank skinner. what aspiring journalist wouldn't take up that opportunity? >> she and her classmates set out to find hank's ex-girlfriend andrea reed who had by now recanted her testimony against hank. >> andrea reed is an excentric woman. in meeting her alone you find little things unique to andrea reed. she keeps a rattlesnake in her trailer. >> your name? >> andrea reed. >> she rightfully is concerned. she would only be willing to talk to us in an audio file. we wouldn't be able to capture her image. >> now, you ...

They were able to talk to him. >> police polygraphed him five times. he was put in jail clothing. given little food or water and held in a small interrogation room for hours. across the country, denise's friends didn't know any of this, but they know enough to be worried. >> i mean, someone being kidnapped, to be honest, a lot of those stories don't end well. you don't want to think about those things, but you think, maybe they're not going to be alive. >> then about 33 hours after denise disappeared reporter henry lee was standing outside of aaron's home when his phone buzzed. an e-mail. >> w...

Decided to encode in d.n.a. a photograph of their institute a text on genetics some shakespeare's sonnets and an audio file of martin luther king's famous i have a dream speech. yeah. the challenge was to move from a computer language consisting of zeros and ones to a much more complex genetic code that involves not just two but four components the four d.n.a. molecule symbolized by the letters ac. these four elements came together at the bottom of the oceans millions of years ago to create the vocabulary of life. the famous d.n.a. double helix is certainly is a first code that ever existed on...

But with d.n.a. we have four that we can use and it's like it's like looking at lego where i have four colors of blocks and i can put those together in any order to make a message and we devised a code that would use different it's like colors but letters of d.n.a. . little block would represent one byte or one small part of the signal and then we could put those together in any order to make the largest signal and we devised a code that would do this but would minimize the number of errors that would happen due to reading and writing. goldman and his staff started with the zeros and ones and ...