Second annual SJ Mini Maker Faire - BANGPhotos
Spencer Helsing, 10, of San Jose, reacts as he tries out a robotic arm made of cardboard at the second annual San Jose Mini Maker Faire at History San Jose Park in San Jose, Calif., on Sunday, September 4, 2016. (Josie Lepe/Bay Area News Group)

Spencer Helsing, 10, of San Jose, reacts as he tries out a robotic arm made of cardboard at the second annual San Jose Mini Maker Faire at History San Jose Park in San Jose, Calif., on Sunday, September 4, 2016. (Josie Lepe/Bay Area News Group)