I made paper centrifuge in science mania class today. The paper centrifuge material was simple. But there were no materials in my house. So I went to the mart to buy the materials. There was no suitable material, but I bought it. To make paper centrifuge is a little hard. It was quite successful when I made it. I have never experienced the effect of paper centrifuge with blood. I could learn the principle and necessity of paper centrifuge today. I felt good.