How-To Geek on MSN

90% of Excel spreadsheets contain errors: Here’s how to fix yours

Build bulletproof workbooks with named ranges, dynamic tables, and Excel's built-in error-checking tools.
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.