I've always been attracted to cars and driving is a completely measurable experience: if you qualify last on the grid you're the slowest and if you qualify first on the grid you're the fastest. So no one can say you're slow if you're fast and no one can say you're fast if you're slow.
There's a lot of interest from the medical community on how things develop in microgravity and the hope later that is expected to apply to what the changes are in humans as well.
