The Heinrich Hertz Institute turns 91. To celebrate this occasion, Fraunhofer HHI organizes the “Technology Innovation Day – 91 Years HHI” on February 22, 2019. Particularly students of the universities of Berlin and its surroundings are invited to attend. Insights into the innovative research and development at Fraunhofer HHI will be given through short presentations of all research areas and there will be the possibility to participate in guided lab tours.