deletions | additions       diff --git a/Box.tex b/Box.tex  deleted file mode 100644  index fda78d6..0000000  --- a/Box.tex  +++ /dev/null 
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So the product of the first 3 terms is now well established and is, using a conservative approximation, of order 1.   $N =\underbrace{\overbrace{R}^{\approx10} \times \overbrace{f_p}^{\approx 1} \times \overbrace{n_e}^{\approx 0.2}}_{\sim 1} \times \underbrace{f_l \times f_i \times f_c \times L}_{?}$  We can then simplify the Drake equation and re-write it in its "2014 form" as:  $N \approx f_l \times f_i \times f_c \times L$  diff --git a/layout.md b/layout.md  index f8cec44..41b6b9a 100644  --- a/layout.md  +++ b/layout.md 
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figures/Drake3/Drake_Annotated.jpg  Equation.tex  Updating Drake Eq.tex  Box.tex  Astrobiology.tex  fc.tex  L.tex