deletions | additions       diff --git a/Swimmers.tex b/Swimmers.tex  index 8c1e82b..39ad070 100644  --- a/Swimmers.tex  +++ b/Swimmers.tex 
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{\bf QUESTIONS}  \begin{enumerate}  \item {\bf {\it  Why do the swimmers float on top? top?}}  \item For now consider the simple case of a single inert particle in a (fixed) concentration gradient. Say it moves towards the source of the chemical. It will follow some mean trajectory, but with plenty of scatter. This is an out-of-equilibrium process.  \begin{enumerate} 
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\item Depends on whether the particle is charged or not.  \end{itemize}  \item {\it {\bf  What are the statistics of this motion -- how much variance is there? there?}}  \item {\it {\bf  Which part of this setup is out of equilibrium? equilibrium?}}  \item {\it {\bf  What does the scatter in trajectories tell us about the system? system?}}  Anything useful? Use linear-response theory (is this justified? Why?). \end{enumerate}   \item Then consider a single active swimmer in a concentration gradient. Get superposition of two behaviours?