David Aguilar and his father, Ferran Aguilar, are from Andorra, in Europe. David was born missing part of one arm. At the age of nine, he designed his first prosthesis with LEGO bricks, and in high school he built the next generation, which he named the MK-1. David’s father encouraged him to make a video about his prosthesis and the huge role that LEGOs played in his life, and posted it on social media, where it went viral and changed both of their lives. In addition to telling his story in this book, David is also the protagonist of the Spanish documentary Mr. Hand Solo, which won the award for best documentary at the Boston Science Fiction Film festival. David is currently developing his own brand, Hand Solo, which will aim to benefit various organizations for the disabled and fight against the stigma of “diff-ability,” as he calls it. Follow David and Ferran on Twitter @Handsolooficial and @AguilarFerran. David Aguilar and his father, Ferran Aguilar, are from Andorra, in Europe. David was born missing part of one arm. At the age of nine, he designed his first prosthesis with LEGO bricks, and in high school he built the next generation, which he named the MK-1. David’s father encouraged him to make a video about his prosthesis and the huge role that LEGOs played in his life, and posted it on social media, where it went viral and changed both of their lives. In addition to telling his story in this book, David is also the protagonist of the Spanish documentary Mr. Hand Solo, which won the award for best documentary at the Boston Science Fiction Film festival. David is currently developing his own brand, Hand Solo, which will aim to benefit various organizations for the disabled and fight against the stigma of “diff-ability,” as he calls it. Follow David and Ferran on Twitter @Handsolooficial and @AguilarFerran.