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\item {\it Understand why it moves (diffusiophoresis): how fast and in what direction?}  \begin{itemize}  \item Depends on whether the particle is charged or not: consider {\it uncharged} for now.  \itemSee e.g.  \citet{2010PhRvL.104m8302P}, \citet{1982JFM...117..107A} \citet{1982JFM...117..107A}, \citet{2008NatMa...7..785A}.   \item  \end{itemize}  \item {\it What are the statistics of this motion -- how much variance is there?}