The city has also developed a particularly large cluster of video game developers, the largest of which, Electronic Arts, employs over two thousand people. Vancouver also has a vibrant tech startup scene. Startups headquartered in Vancouver include PlentyofFish and HootSuite. Slack, the world's fastest growing business app of all time, was created in Vancouver. Greater Vancouver is also home to MDA, a pioneering space and defense company behind technologies such as the Canadarm and RADARSAT-2. Additionally, Vancouver is emerging as a world leader in fuel cell technology, accounting for 70 percent of Canadians employed in the industry. The National Research Council Institute for Fuel Cell Innovation is located in Vancouver, and the headquarters of Ballard Power Systems is in neighboring Burnaby.