Because Song does not like to communicate with ordinary adults too much, his father has explained that Ramond-Ramond or Neveu-Schwarz-Neveu-Schwarz forces are able to compensate gravity as a consequence of supersymmetry, which makes flying BPS cars float in the atmosphere.
The Reference Frame wishes Song good luck with his project. :-)
Yes, ....but.... every metal stuff will be attracted to the ground.
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