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Note that the value of A tends to be small and fluctuates randomly in the spectral frequency domain for uncorrelated random noises or radar returns from diffusive targets distributed uniformly and randomly in echoing region, and its value is expected to approximate 1 for the echoes from highly localized and structured targets with high signal-to-noise ratio (SNR).
When Bush talked of the "ideals of justice and conduct that are the same yesterday, today, and forever," he was echoing Hebrews 13:8, which says, "Jesus Christ is the same yesterday, today, and forever."
However, physicists in Europe and the United States have recently been creating environments in the laboratory and underwater that exhibit reversed echoing. Instead of actual walls, from which only run-of-the-mill echoes would reflect, the researchers direct their sounds to computerized micro-phone-loudspeaker units that return them in a time-reversed order--the last sound component to arrive is the first to be sent back.