deletions | additions       diff --git a/Equation.tex b/Equation.tex  index 92c1dc9..b6070b5 100644  --- a/Equation.tex  +++ b/Equation.tex 
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\item $R$ is the rate of star formation, which tells how many stars are born every year in our Galaxy.  \item $n_e$ is the average number of habitable planets in any planetary system  \end{itemize}  All the $f$ terms are factors $\le 1$, corresponding to 1$:  \begin{itemize}  \item $f_p$ is the fraction of stars that have planets   \item $f_l$ is the fraction of planets where life actually begins