Like a lot of Polish 17-year-olds, Mateusz Mach is into hip-hop.
“It is something I identify with,” Mach says.
Unlike a lot of Polish 17-year-olds, he decided to turn his appreciation into an app business. After six months of work, he released Five, a messaging app for Android, iPhone, and Apple Watch that lets you and your friends throw one another custom hand signs, like the kind rappers throw.
Further read at: http://uk.businessinsider.com/polish-entrepreneur-made-apple-watch-easier-for-deaf-people-2015-5