Citadel, led by billionaire Ken Griffin, has chosen 14 students from a large pool of applicants to participate in their summer internship program. The interns, specializing in math and computer science, are staying at a luxury hotel in Hong Kong and working on coding projects. The interns will earn $120 per hour and gain exposure to potential employers in the trading industry. The interns work on algorithms for risk hedging and identifying arbitrage opportunities, and their behavior and interaction are evaluated.