I'm writing this in October 2020, and I'm teaching Intro to Materials Science and Engineering to the second year (3rd semester) undergrad students at IISc. I'm not thrilled with any of the options that I'm using for online teaching -- Microsoft Teams and all the stuff that comes with it (OneNote, etc.). So, I am now back to Blogger.com to start posting stuff for my courses, and let us see how this experiment goes. Maybe it'll go better than Teams, simply because I have some familiarity with this platform. Let me start things off with a couple of videos from Veritasium's Derek Muller for the module on crystal structures. While one of the videos is worth watching for the sheer fun, I also like the other one for the way it packs, within ~15 minutes, some four centuries worth of research in physical sciences and mathematics. I heard about something called "shade balls" through this video: And, here's a screenshot from the video showing 2D arra...