What is "commenting out" and why did you do it? 

JoshuaZ magically made a paragraph disappear, and wrote: 
"Allegations of suppression of cold fusion research - commenting out correctly." Evidently he feels this paragraph should go, because he imagines it is "original research." Since he is a skeptic he will insist on this despite all evidence to the contrary.

My question is, why not simply delete the offending paragraph? What is this commenting out business, and why bother with it?

The claim that a letter from Nature constitutes "original research" is mind-boggling. Would a letter from Pres. Bush also be "original research"? In what sense? The content of this letter is common knowledge to hundreds of cold fusion researchers, and it has been discussed in two books, but evidently JoshuaZ is determined to find an excuse to keep the rest of the world from finding it on Wikipedia.