Gmail Preferences

I was looking for a way to be able to quickly read through the massive amounts of emails I get as an educator. I was getting annoyed that if you wanted to read a message you had to click it to open, and it would reload. Being an impatient teacher, I wanted to sift through quickly. I noticed that yahoo mail offers a feature where the message preview is to the right of the message list. So I thought, there has got to be a way to do this in Gmail, and sure enough  there it was. So if you want your in box to look like this. 

Click on the Gear icon > Settings

Click on the labs tab and search for "preview pane"  and enable the option. When your mail reloads you will have the preview pane.