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+\section{Closest apple}
+
+One interesting bot we can write is one which always moves towards the closest
+apple. Both the idea and the coding are a little tricky, but see if you can
+handle it. In order to find the closest apple, we actually want to know
+the \emph{shortest path} to the apple, and when we know that, the first step in
+that path is the direction we need to move in.
+
+To find the shortest path, we need to use an algorithm called
+\emph{breadth first search} (BFS).
+% TODO: description of the algorithm
+
+\pythonfile{closest_apple.py}