During my time on this project. I chose to walk to school every day instead of the buildings are all vehicles to help the world save energy. Another benefit of walking is to reduce weight.But it makes my daily exercise. Doing the math, this cattle is estimated to reduce weight by walking every day for 1 month at Mae Fah Luang University, from 15th November 2556 to 15th December 2556.Topics in Mathematics for Life save my life save my world.