To fix an Excel spreadsheet not adding up correctly, check the SUM function's syntax and make sure there aren't any text format cells in the sheet.

If you want to sign a PDF, this post talks of free tools that let you add a signature to PDF. Type or draw a signature using them.

When asked whose signature move he would add to his bag, he fired off immediately. "I would take Dirk Nowitzki's fadeaway as a signature move." ...