deletions | additions       diff --git a/Swimmers.tex b/Swimmers.tex  index 56fdb14..71d631c 100644  --- a/Swimmers.tex  +++ b/Swimmers.tex 
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\begin{enumerate}  \item Understand why it moves (diffusiophoresis): how fast and in what direction (on average)?  \begin{itemize}  \item See e.g. \citet{http://adsabs.harvard.edu/abs/2010PhRvL.104m8302P},\citet{http://adsabs.harvard.edu/abs/2005PhRvL..94v0801G}  \item Depends on whether the particle is charged or not.  \end{itemize} 
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\end{enumerate}   \item Then consider a single active swimmer in a concentration gradient. Get superposition of two behaviours?  \begin{itemize}   \item Re-read \citet{http://adsabs.harvard.edu/abs/2005PhRvL..94v0801G}   \end{itemize}  \end{enumerate}  %%==============================================