Dear Fabien,
thanks for your reply. I'm desperately trying to juggle different conversational threads in this contest, so I apologize if I might sometimes take a while to respond.
I think that the issue of losing the substance of a question due to a 'translation' into the scientific realm is an important one---and incidentally, I agree (and have made the point a few times myself) with your example of Zeno's paradoxes. In a sense, the mathematical 'answer' doesn't really tell us anything at all about how motion is possible; it gives a description, but does not really dispel the mystery. That description, of course, can also be had by simply moving to the other side of the room, or overtaking tortoises (I tried it, it's possible---how's that for empirical philosophy?).
That said, the questions spawned in the scientific realm are in themselves important ones---not least because answering them allows us to build nice things, like computers and rockets. So I think, we must find a way to keep both in view---not in the competitive sense that's often on display in the present discourse, with scientists belittling philosophers as having nothing to say with many words, and philosophers deriding scientism (both of which are, incidentally, sometimes also valid complaints), but rather, in a mutually reinforcing way.
The German physicist and philosopher Carl Friedrich von Weizsäcker coined the term 'Kreisgang', literally something like 'circle-walk' or 'circumnavigation'---we return to the same topics, with a deepened understanding, and lift them again onto a higher level of appreciation. This is something that, I think, we should strive the interaction between philosophy and science to further---the philosophical questions spawning scientific investigations, which in turn help us to rephrase the philosophical issues, and so on.
Perhaps there's some way of expressing this more clearly; I shall think about that.
Cheers
Jochen