Venture capital firm Y Combinator hosted its Demo Day, where startup leaders pitch their ideas to venture capitalists. The startups are in a variety of industries from data storage, drones, robotics, and AI. One company, Atomarine, plans to reduce energy and water consumption by building data centers offshore on barges where the servers are cooled by seawater and are powered by nuclear energy. Another firm Isengard Industries has already generated $10 million dollars in revenue by creating affordable American made attack and counter attack drones and selling them to allied nations. Yet another startup, Praxis Robotics, is using video data to create training material for robots to learn tasks quicker. These innovative firms promise to accelerate growth in the tech sector dramatically.