“When I was 14 years old, I had low self-esteem,” yo-yo champion BLACK begins his talk during session 4 of TED2013. “Then one day, I bought a yo-yo.” The first trick he tried — well, it didn’t work. But after a week of practice, he started to get somewhere. He remembers, “I thought, ‘The yo-yo is something for me to be good at. For the first time in my life, I found my passion.'” But practicing fo