When Brandon Glorioso told his teachers he was going to build a computer inside a fish tank filled with liquid, some of them said it would never work. Two weeks later, he proved them wrong, reports U.S. News & World Report. Glorioso, a senior at North Carroll High School in Maryland, is already playing games on his custom computer, which he built entirely out of spare parts he had lying around the house. The only cost he incurred was $94 for a 4.5-gallon bottle of mineral oil to fill the tank. The oil, which circulates through the system, is a critical component, said Glorioso, who said he came up with the idea when trying to find a way to keep a computer from overheating, which happened frequently when he and his friends played PC games. Most computers are cooled by fans, but the number of fans he would need to cool the 3.4-gigahertz processor in his newly assembled computer would make the system loud and disruptive, he said. Some people build water-cooled systems for computers, but those can be dangerous, he added. Mineral oil, on the other hand, is a nonconductive substance. Glorioso was able to submerge everything but the computer’s power supply and two hard drives in the substance, which flows through pipes into a homemade radiator…