Pourtant, il n'y a PAS DE COMPRESSION mat??rielle ou physique de l'engin. <a href="http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html">http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html</a> The bug-rivet paradox is a variation on the twin paradox and is similar to the pole-barn paradox....