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throwaway4good 4 months ago | parent | context | favorite | on: GE Aerospace Successfully Develops and Tests New H...

Supersonic = +1 mach, hypersonic = +5 mach.

dghughes 4 months ago [–]

But toothbrushes are ultrasonic. I can never find mine.

banku_brougham 4 months ago | [–]

the plasma ball is opaque to radar, making it hard to detect.

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