Those of us who remember the Presidency of Richard Nixon still wonder what was on that 18 ? minute gap that got erased in one of his White House recordings. As Senator Howard Baker demanded during the investigation of the Watergate break-in, “What did the president know, and when did he know it?”

Thirty years later, the mystery may finally be solved. “We have decided that the time is right and appropriate to determine whether that conversation can be retrieved or recovered,” says Karl Weissenbach, a Nixon tape archivist at the National Archives. The tapes were last examined in 1974. Since then, technology used to decipher recordings has improved dramatically.
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