# From Sand to AI This is a collection of notes and articles (some people call it a "digital garden[^1]", also "second brain") about the fractal hierarchy of [[What Are Digital Systems?|digital systems]]—from electrical signals to data centers—and other topics including wireless communications and aerospace. My intention here is to go from the very foundations; from electromagnetic waves, all the way to semiconductors, software, algorithms, and machine learning, and explore the systemic foundations of [[Artificial Intelligence|artificial intelligence]]. Note that this place combines content I have authored with curated content pulled from different books and online sources. All credit is given to the best of my knowledge. Let me know otherwise. Gardener: [Ignacio Chechile](https://www.linkedin.com/in/ignacio-chechile-101/) (ignacio at ignaciochechile dot com) > [!tip] > Use the navigation pane on your left to go through the notes (upper left for phones) > [!attention] > Dark mode may screw up some images with transparent backgrounds. You can briefly switch to light mode to see an image as needed. > [!info] > For a better browsing experience, use a laptop (phone does not let you navigate so easily, but if you go by phone, browse horizontally otherwise some figures and formulas might not show correctly) > [!warning] > These notes are a constant work in progress. Sections might be expanded (or shrunk) at any given time. Feedback is welcome. If you need a bit of a push to start, you may consider starting here: [[To Engineer is (Still) Human (Start Here)|To Engineer is (Still) Human]] Or of you wanna go technical right away, consider starting here: [[Hierarchy of Digital Systems (Start Here)|Hierarchy of Digital Systems]] [^1]: A digital garden is an online space at the intersection of a notebook and a blog, where owners share bits of thoughts on a variety of topics. Contrary to a blog, where articles and essays have a publication date and start decaying as soon as they are published, a digital garden keeps evolving: owners keep on adding, editing, and refining their notes. Some people also call it the "second brain".