The culprit that caused the leak in Luca Parmitano’s spacesuit that nearly drowned him has still not been completely isolated: NASA Still Probing Cause Of Spacesuit Water Leak – Aviation Week.

I think this problem is relevant to the endless arguments over Moon vs Mars in an exploration/development priority list. There must be many such subtle problems that won’t come up until we see lots more activities in space and for longer periods. It is much easier to find and fix this sort of problem when earth is nearby than if it is 9 months away.