diff --git a/book/basics/how-sourdough-works.tex b/book/basics/how-sourdough-works.tex
index 8e73cc0..77b86f1 100644
--- a/book/basics/how-sourdough-works.tex
+++ b/book/basics/how-sourdough-works.tex
@@ -211,9 +211,11 @@ tweak just by adjusting the speed of your dough's fermentation.
 
 \section{Yeast}
 
-Yeasts are single-celled microorganisms belonging to the fungi kingdom, and
-spores that are hundreds of millions of years old have been identified by
-scientists. There are a wide variety of species --- so far, about \num{1500}
+Yeasts are single-celled microorganisms belonging to the fungi kingdom. They
+can reproduce through either budding or by building spores. The spores are
+incredibly tiny and resistant to external factors. Scientists have found undamaged
+spores that are hundreds of million years old. There are a wide variety of
+species --- so far, about \num{1500}
 have been identified. Unlike other members of the fungi kingdom such as mold,
 yeasts do not ordinarily create a mycelium
 network~\cite{molecular+mechanisms+yeast}.\footnote{For one interesting