Jeff_UK wrote:3. How many piano tuners are there in the entire world?Spoiler:about 6 billion, Depending on your definition of 'Piano Tuner.' Someone who attempts to tune pianos but doesn't call themselves a piano tuner, surely is one, and equally, someone who calls themselves a piano tuner but never gets any work is still a piano tuner. Therefore, is not someone who does not call themselves a piano tuner AND has never had the opportunity to tune a piano still a piano tuner?
I went at this in a more serious way, but still came to a similar answer: My answer depends on how many tuners you need. If Google plans to install one Grand Piano in each of it's facilities, there are probably two or three tuners per city. If Google plans on expanding into the music industry, it'd probably better to use their computer expertise and automate the process, requiring only a couple human tuners to make sure the machines are doing the job right. If, say, Pianos become sentient and decide to kill all humans that are of no use to them, we could train everyone to tune pianos (except deafs, amputees, and other people obviously not able) given a year or two.