The Luz bone corresponds to the Mitzvah of Melaveh Malka. (Wikipedia quotes the Kaf haChaim (300:1-2) as saying this, although I thought that this was first stated earlier than him)

Is there a list of Mitzvot and their corresponding body parts?
I live in an 8 unit co-op.  Recently had the bathroom totally redone.  New pipes and bathtub/shower. My new shower seems fine.  Not long after I got this done I have noticed someone is causing a high pitched sound when they take a shower.  Could the plumbing done in my unit cause someone else to experience this problem?  Could the pressure change in my Unit cause someone else to have pressure problems.  What should I do about it? The noise is very load.
