Veteran to janitor to physicist: how Josh Carroll changed his life with YouTube

<p>Could you learn trigonometry in 3 weeks if your life depended on it?</p> <p>In this episode of TechFirst with John Koetsier we chat with Josh Carroll, who volunteered with the US Army after 9/11 before he finished high school, &nbsp;did 3 tours of duty in Afghanistan, then came back and worked, among other jobs, as a high school janitor.</p> <p>In the library of the high school he was cleaning he found A Brief History of Time, by Dr. Stephen Hawking, and rediscovered his love of science. Then he taught himself advanced math via YouTube on his path to becoming a physicist ...</p> <p><strong>Want more?</strong></p> <p>Full transcript will be here: https://johnkoetsier.com/category/tech-first/<br> Follow on Twitter: https://twitter.com/johnkoetsier<br> Watch the video on YouTube: https://www.youtube.com/c/johnkoetsier?sub_confirmation=1</p>