Recite π as a binary decimal, if you wish. This page is updated annually, subject to my current time zone. On π day, 2014, at about 15:9.26, I ate a chocolate pie (those small ones) during a Chinese literature class, got nearly choked, and had to leave the classroom to search for water... Thank you … Continue reading π Day Memories
Good evening. I am not the last one to leave. Well, the motivation's been comparable to the excitement of unlocking a new part of the game world in a racing game, that becoming an official staff in physics somehow encouraged me to immediately desire to work after hours. Knowing that this wouldn't work long-term, I … Continue reading Photo Stories: Physics Department at Night
Some of my text-friends ask me how I can quickly type out mathematical symbols when we are discussing homework problems. Well, for one, I enabled the Greek keyboard on my phone, and then there's this: taking advantage of the automatic text-replacement system built right in macOS and iOS. To use this table, on iOS and … Continue reading QuickType Scientific Symbols [Updated March 5th]
Building a new camera rig with some pre-fabricated shortcuts.
An over 1,800-year-old poem revisited :).
Flashback to five years ago.
An interesting problem calling for "high perspectives" on elementary maths.
First post of another new category, or maybe this falls into the old "Poetry" bin. I had packed my stuff early in the evening for the comet / meteor shower situation, only to have my expectations quenched by an untimely thunderstorm. Well, I have heard of it in the forecast, but was not expecting the … Continue reading Photo Stories: Lightning
Lurking in my recent research readings, this is a problem at the intersection of middle school geometry and quantum chaos ... This week's post was delayed such that certain subscribers taking final exams won't be disturbed. Hope you all had fun. Question: Inscribe a triangle of minimum perimeter inside an arbitrary acute triangle. Demonstration I. … Continue reading FW’S NOTEBOOK #2 – Fagnano Problem
Will I have some theme for these posts? The question is, again, rather easy to state. But to me, it is one of the best introductory examples to ODE solving and chaos with a simple physical model. Q1. Describe the motion of a simple pendulum were you to replace the massless string with a spring … Continue reading FW’s NoteBook #1 – The Spring Pendulum Problem
I guess you know the drill by now. Round earth with a moon whizzing around, and the pair occasionally block sunlight from each other. Neat stuff. Do you want to see an actual ray diagram of that? Yes! Well, I drew one in Adobe Illustrator, and then converted it to html. Edit: WP Does not … Continue reading What Does it (really) Take for an ECLIPSE?