He argues that in signing those accords Yasser Arafat put the principles of recognition and a possible two-state solution ahead of the need to stop the process of Israeli colonisation which was shredding one of those two states to ribbons.

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But audio experts say that the basic principles the CIA uses are likely the same ones that have driven the field of voice recognition since the 1940s: use of a spectrogram, a visual representation of the frequencies of human speech.

NPR: Bin Laden Tape Won't Raise Security Levels