How to Create a data validation drop-down list from a table with duplicates in Excel

New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 608th installment in their series of digital spreadsheet magic tricks, you'll learn how to to create an expanding data validation drop-down list from table with duplicates using a number of different tricks.