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Professor Cho Jae-weon at South Korea’s Ulsan National Institute of Science and Technology (UNIST) has developed BeeVi, an eco-friendly toilet that uses human waste to generate electricity to power a building. Professor Jae-weon has also created a virtual currency, Ggool, which is earned by using the BeeVi toilet. A person can earn up to ten Ggool a day, which can be used to purchase goods such as freshly brewed coffee or instant cup noodles, fruits and books on campus at UNIST.