%0 Journal Article %T Twin Paradox and Causality %A T. Grandou %A J. L. Rubin %J Physics %D 2007 %I arXiv %X After pointing out the historical avatar at the origin of a would be twin or clock paradox, we argue that, at least on a local scale, the (re-qualified) paradox is but a necessary consequence of the sole principle of causality. %U http://arxiv.org/abs/0704.2736v1