Like the show? Send us a text message on what you liked.When did you start using Excel, and how did you learn it?Jeff Lenning is the founder of Excel University, and he joins us to discuss the biggest mistakes he sees in Excel workbooks, the differences between formal and informal training, and why both are critical.We also walked down memory lane, discussing when we started using Excel and some of our favorite functions inside this powerful application.Finally, we tip our cap to two very fam...