Fixed weird sentence about electrostatics

Author: EfremBraun

paper/basic_training.tex

@@ -351,7 +351,7 @@ \subsubsection{Key concepts}
 %\item Long range nature of the Coulomb interaction
 Electrostatic interactions are both some of the longest-range interactions in molecular systems and the strongest, with the interaction (often called
 ``Coulombic'' after Coulomb's law) between charged particles falling off as $1/r$ where $r$ is the distance separating the particles. 
-In classical molecular simulations, atoms are typically represented by sites bearing charge in units of fractions of an elementary charge, so atom-atom interactions are thus necessarily long range compared to other interactions in these systems (which fall off a $1/r^3$ or faster).  
+Atom-atom interactions are thus necessarily long range compared to other interactions in these systems (which fall off a $1/r^3$ or faster).  
 This means atoms or molecules separated by considerable distances can still have quite strong electrostatic interactions, though this also depends on the degree of shielding of the intervening medium (or its relative permittivity or dielectric constant).
 
 %\item Polarizability, dielectric constants