I was 15 when my dad brought home an Apple IIe with VisiCalc on a floppy. Since I had taken a computer class at school (learning BASIC on a Commodore PET) he asked me to help. I ended up installing it and out how to build a spreadsheet for his non-profit. I didn't realize it at the time, but this moment reverberated into a long and successful career. The early days of which were centered around making spreadsheets for a wide array of businesses. VisiCalc literally changed my life.