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    Alexandra Bruce
    August 24, 2010

    . . . but there are tantalizing clues, such as images of high-altitude doughnut-shaped sonic boom contrails . . . and the sonic evidence perceived by the presenter of this clip.

    The presenter heard a series of sonic booms while in either California or Nevada — something that could be heard, felt but not seen.

    Alarmingly there’s no evidence of government spending on this plane.

    Its doughnut-shaped exhaust pattern indicates it uses a pulse detonation wave engine. It’s enough power to drive an airplane to six times the speed of sound.

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