deletions | additions       diff --git a/layout.md b/layout.md  index 422dfee..79961d5 100644  --- a/layout.md  +++ b/layout.md 
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With_an_estimated_diameter_of__.tex  Now_we_have_some_constraints__.tex  section_Option_1_Intelligent_life__.tex  figures/Lcritical/Lcritical.png  section_Option_2_The_Lifetime__.tex  Derive L.tex  figures/Lcritical/Lcritical.png  figures/Drake4/Drake_Equation.jpg  Notes.tex