diff --git a/lectures/preamble.tex b/lectures/preamble.tex
index 6150547..a325d47 100644
--- a/lectures/preamble.tex
+++ b/lectures/preamble.tex
@@ -174,9 +174,9 @@
 \titlespacing{\subsubsection}{0pt}{0pt}{0pt}
 \titlespacing{\paragraph}{0pt}{0pt}{-0.5\parskip}
 
-\titleformat{\section}{\normalfont\Huge\sffamily\bfseries\filcenter}{\theparagraph}{1em}{}
-\titleformat{\subsection}{\normalfont\Large\sffamily\bfseries}{\theparagraph}{1em}{}
-\titleformat{\subsubsection}{\normalfont\large\sffamily\bfseries}{\theparagraph}{1em}{}
+\titleformat{\section}{\normalfont\Huge\sffamily\filcenter}{\theparagraph}{1em}{}
+\titleformat{\subsection}{\normalfont\Large\sffamily}{\theparagraph}{1em}{}
+\titleformat{\subsubsection}{\normalfont\large\sffamily}{\theparagraph}{1em}{}
 \titleformat{\paragraph}{\normalfont\normalsize\sffamily\bfseries}{\theparagraph}{1em}{}
 
 % repurpose \paragraph as \subsubsubsection (which it sort of is already)
@@ -256,7 +256,7 @@
 \def\labelitemiv{\footnotesize\raisebox{0.2em}{$\triangleright$}\normalsize}
 
 % my attempt at creating a flat nested list environment
-\newenvironment{nest}{\setlength{\parskip}{0.3\baselineskip}}{\setlength{\leftskip}{0pt}\vspace{-2pt}\setlength{\parskip}{\slideparskip}}
+\newenvironment{nest}{\vspace{5pt}\setlength{\parskip}{0.3\baselineskip}}{\setlength{\leftskip}{0pt}\vspace{-2pt}\setlength{\parskip}{\slideparskip}}
 
 \def\liUndent{-10pt}
 \def\liVgap{-4pt}