deletions | additions       diff --git a/Consider_trying_to_understand_Frank__.tex b/Consider_trying_to_understand_Frank__.tex  index 05ac608..86429e7 100644  --- a/Consider_trying_to_understand_Frank__.tex  +++ b/Consider_trying_to_understand_Frank__.tex 
...
Consider trying to understand Frank Drake's \tbf{Fermi \textbf{Fermi  Paradox} which estimates the number of technological civilizations that might exist among the stars. \begin{equation}\nonumber  N =\underbrace{\overbrace{R}^{\approx10} \times \overbrace{f_p}^{\approx 1} \times \overbrace{n_e}^{\approx 0.2}}_{\sim 2} \times \underbrace{f_l \times f_i \times f_c \times L}_{?}  \end{equation}