How-To Geek on MSN

Excel's UNIQUE function can't skip columns—unless you use this trick

Nest CHOOSECOLS inside UNIQUE to extract non-adjacent columns, and use INDIRECT for interactive header dropdowns.
How-To Geek on MSN

6 silent Excel spreadsheet killers (and how you can stop them)

Audit hidden data, filters, and hard-coded values to ensure your Excel spreadsheets are professional and precise.