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Book Recommendation: The Remembrance of Earth's Past Trilogy

On Earth, humankind can step onto another continent, and without a thought, destroy the kindred civilizations found there through warfare and disease. But when they gaze up at the stars, they turn sentimental and believe that if extraterrestrial intelligences exist, they must be civilizations bound by universal, noble, moral constraints, as if cherishing and loving different forms of life are parts of a self-evident universal code of conduct. I think it should be precisely the opposite: Let’s turn the kindness we show toward the stars to members of the human race on Earth.  ― Liu Cixin, The Three-Body Problem Book 1: The Three-Body Problem Book 2: The Dark Forest Book 3: Death's End Genre: Science Fiction Author: Cixin Liu Translators: Ken Liu (book 1,3) / Joel Martinsen (book 2)
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Understanding Semiconductors - Introduction

 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 '...
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I Created a Perfect Star (Again)

 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...
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