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While I was in college my friends and I produced a cube 50cm cube onside had a rubber covering and the oppisite side had a 10cm hole in the center.
If we hit the rubber end in the center we could blow out a candle at 30m.
It is not very high tech but it worked so the military stuff rules!!!
It was a bitch to aim though... I blame the wind and the school board for not let letting play with fire inside their school.
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