Sometimes we take pride in what we create and design that we present it in a complicated way just to show that we are smart and what we do is highly important. Doing so, we forget that the best design is a simple one, as most of us would say "keep it simple ... ". As an engineer and scientist, I focus on ultrasonics in material science where I need to understand and apply advanced theories and concepts from mathematics and physics. However, like anyone else, I appreciate when such concepts are explained in a simple and clear way. From my experience I know that explaining difficult concepts in simple terms requires deep understanding of what is behind the surface. We easily recall F = ma and appreciate the value of this relationship. Newton's second law for example is probably the most used relationship. And, yet it took a lot of effort and understanding on Newton's part to simplify his work in such clear terms. It is my hope that what I upload in this channel will be clear and simple.