How I hacked TeachNext

Sumitha Aurora textbooks - system call in stdio.h

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Thinking about how to understand systems

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Table of Cohesion and Coupling (Source: https://feature-sliced.design/docs/reference/isolation/coupling-cohesion License: Unknown / Probably Copyrighted )   This is a method by which we understand systems in programming. As the image shows, cohesion is how much similar things are grouped together, and coupling is how much different groups are connected to one another. If I'm thinking about nature, there are a plethora of behaviors, but all of them have common fundamental behaviors. It is easy to understand it as how if we consider the known materials of the world, they are all built up from the same types of elements, which we call atoms. Elements of reality, as we could call them. At the same time, the combination of different elements is what makes reality wonderful, as otherwise everything would have been so stagnant or predictable. This is the general principle of art, to bring into attention a new perspective, and that is ingrained with every part of reality. Thinking in that ...
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Energy Efficiency

#Draft Start by defining Power Density and Energy Density. Energy = VIt = Vq Describe Energy as the area of a rectangle with sides Voltage and Capacity or Charge (q=It) Contained. If this is the energy contained per unit mass of a material, this is it's Energy Density. Now, if we consider the energy utilized per unit time, that is Power Density. From this, you can know that for a given fuel, if its Power Density is Higher, its duration is lower. Now, this is the energy conversion for chemical batteries. We also often see the Power Density of Gasoline and other fuels mentioned, which unsurprisingly have the same units. In case of Gasoline and Wood, we take the Energy Density as the Heat of Combustion per unit mass. But Combustion is yet another chemical reaction, a redox reaction. Except that in this case, we utilize the heat instead of the flow of electrons. What are the other sources of energy? Another one would be the energy from motion (Wind, Water), Geothermal (Heat), Solar (Li...
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A peek into the design of smartphone camera lenses

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Smartphone cameras use a complex set of lenses, that aren't simply convex or concave, or a simple combination of them. I first saw it while looking it up in a patent paper by Apple, but then recently, a person named Stephen Remillard has uploaded a video on YouTube explaining one such paper. I found it interesting, so I'm linking it here:
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