Mystery Spot không c̣n bí mật:
http://www.lecan.net/MysterySpotAngles5.jpg
http://www.lecan.net/GroundHillAngle.jpg
The Rolling Surface having upward slope relative to Cabin Floor, however, Rolling Surface is downward sloped relative to Horizontal Axis.
Video:
http://www.youtube.com/watch?v=K58r3...layer_embedded
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