Add to My ListCompartirPlayback issues? Try another server.Server 1Server 2Server 3Server 4Server 5Server 6Server 7Server 8Server 9Server 10Server 11Server 12Server 13Server 14Server 15Science Please! : Gravity200181 minAnimationEstreno01 ene 2001PaísCanadaProducciónONF | NFBWhat keeps us down to earth? This clip from Science Please! answers the question.