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  1. P

    Fastest jet in the world? Engine advancement question...?

    I've been reading about the X51 Waverider going mach 6...but didn't the X15 go mach 6.72 back in 1968 or so? Also, didn't the X43 do mach 9.8 in 2004? I'm trying to figure out why the X51 is such an advancement. Thanks!
  2. P

    What is the title of the song in Impossible Quiz?

    The one with the trumpets and stuff..
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