I woke up early in the morning and sat at my computer. I was about to study Japanese when I suddenly remembered how I made a perfect star when I was in high school. At that time, I mastered elementary geometry, so I was able to easily make it with a ruler and a protractor. With a ruler to measure length and a protractor to measure angles, it was easy to make a star. A star is a polygon with ten sides. Technically, it is a decagon. But a star can be created by laying out only five lines from its center as its frame. To make a perfect star, all five lines must have the same length and must have equal angles between them. A complete rotation has 360°. To determine the angle from one line to the other, 360° is divided by the number of lines, which is 5. 360° / 5 = 72° From the angle alone, and with a ruler and a protractor, a perfect star can be drawn like so: Draw a line with length x from the center upward. Then, measure 72° from the center to its left and right, and draw the...
I still remember when I was in my first year studying electrical engineering at the university, I was working on building a simple circuit from the little knowledge that I had at that time, using the basic components such as resistors, switches, batteries, and lamps. Along the process of my circuit building, I thought to myself, wouldn't it be nice if there were a component that lets current pass in one direction and blocks it from the other? At that time, I thought I was being a smart kid who just posed a very clever question that could change engineering forever. And at that very moment, my naiveté was instantly shattered when I found out about the existence of diodes. It exists . The 'magical' component that I wanted in order to realize the outcome for my circuit actually existed, not to mention it being invented more than a century before I came into being. I was completely awestruck, and I was filled with excitement at the same time. I kept asking, how does this '...