Galileo in spaaace: France's 'equivalence principle' satellite

Do all bodies in a vacuum really fall at the same speed?

Earlier this week, France's snappily-named "Micro-Satellite i trai(R)ni(C)e Compensi(C)e pour l'Observation du Principe d'Equivalence", aka Microscope, rode a Soyuz lifter to orbit on a mission to " test the equivalence principle, which postulates the equality between gravitational mass and inertial mass"."