\documentclass[10pt]{article}
\title{Another Example}
\author{Mac Mason}
\begin{document}
\maketitle
\section{Introduction}
Four score and seven years ago, our forefathers 
brought forth on this continent a new nation\ldots

And then, they also brought forth a second paragraph, which looked
like this, and continued well onto a second line so that it might be
clearer what would come to pass.
\subsection{Materials Used}
This time, we didn't use any materials.
Later in the process, we realized we'd also need a different equation.
\begin{equation}
\chi = \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \dots + \frac{1}{n}
\end{equation}
\end{document}