Ken Lou Castillo was 9 years old when he became the youngest inventor in Guatemala after patenting Mr. Fuego, a firewood made of recycled materials. After discovering he is allergic to smoke, Ken created the firewood with materials such as sawdust and paraffin so he could join his family during occasions involving the use of fire. His invention, which is neither harmful to people's health nor the environment, has earned him membership in the Guatemala Inventors Commission and the Erick Barrondo Order.