An author, Kilgore Trout, uses star system in his novels. Therefore, the same person shows up in the different stories. One of them are Billy. Billy's story is impressive for me, so I will write it here. In a certain Billy's story, Billy confronted a problem in his life. He lost the meaning of his life. He tried to re-invent it by reading science fictions. Since he tried other literatures, but they could not give him the meaning of his life. It was the last his hope. But since his problem was in the fourth dimensional space in this world, he cannot recognize it. He asked for a help to a physiologist. One day, he saw a talk video of a famous person who recently passed away. He told people: every morning, he asked himself in the mirror, ``If today were the last day of my life, would I want to do what I am about to do today?'' and whenever the answer has been 'no' too many days in a row, he knew he needed a change. Although Billy heard this idea before, he w
Mathematics, programming, and a little bit of my life.