Flagging duplicate values in Excel

I was working with Sandra the other day on a project that involved an Excel spreadsheet and about 2400 lines of data. I had to check to see if I had any duplicate values in one of the columns. Since I’m not the sharpest tool in the drawer when it comes to Excel, I asked her if she could help me somehow find potential duplicates instead of me scanning through the list manually. I was duly embarrassed when she showed me just how simple that is… 🙂