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aux2bib (given an .aux file, make a portable .bib file to go with it) doesn't seem to have a manual. Does anybody know how to use it?

Apparently, what I think \centering should do is not really what it does. For example

\documentclass{article}
\begin{document}

{\centering Why is this line not centered?}

{A

\centering B

C}

a

\centering b

c

% why is it that c is centered yet C is not?

\end{document}

Maybe I should stick ...

Let's say X and Y are writing a single paper, and say X writes part 1 and Y writes part 2. Each of these authors has their own tex file containing all of their macros (\newcommand stuff)

X and Y add include their macros together in the preamble:

% preamble
% ...
\input{X-macros.tex} % X's macros ...

Let's say authors X, Y and Z are writing a single paper. Three people may have their own bib files. If X writes part 1 of the paper freely referencing from X's own bib file and Y writes part 2 referencing from Y's own bib file, then there may be some merge issue later.
If X, Y and Z all decides to ...

Usually LaTeX macro takes parameters in the form: \somecommand[opt-param1][opt-param2]{param1}{param2}

But the \blindlistlist command in the blindtext package takes an optional parameter after an obligatory parameter: \blindlistlist[<level>]{<env>}[<x>]

What is the benefit of taking an optional ...