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However, when operating at the top end of these extremely high frequencies, multi-level signal modulation becomes highly sensitive to noise.

One in six tweeted with extremely high frequency despite having few followers, as if they were being used as loudspeakers, not as sharing platforms.

Yet it is present at extremely high frequency in many ethnic groups8, suggesting that there is a strong counterbalancing selective advantage in retaining HLA-DQ8.

The Defense Science Board recommended speeding up the production and the numbers of advanced extremely high frequency communications terminals for bombers and command-and-control aircraft.

The latest airport body scanner machines detect hidden objects with extremely high frequency radiation known as millimeter waves, which bounce off things they strike.