For a lot of kids, STEM subjects (science, technology, engineering, and math) can seem distant and inaccessible. This weekend, Nickelodeon and the city of Burbank kicked off Game+Hack – a three-day hackathon where students, teachers, and novices joined developers, designers, and various representatives from the NASA Jet Propulsion Laboratory (JPL) in La Cañada Flintridge to play with the latest gadgets and build creative mobile apps.