The Hardest Make 24 Puzzles

Make 24 is a traditional math game with simple rule – given 4 numbers, you are asked to make 24 with addition +, subtraction -, multiplication * and division /. Each number should be used once and only once. For example, (3, 7, 2, 1) --> 3 * (7 + 2 - 1) = 24. Most Make 24 puzzles are easy but a few are extremely hard. This post collects some of the hardest puzzles and discuss them in 3 types....

December 25, 2020

An Org-Mode Workflow for Task Management

As mentioned in the last post, I switched to Org-Mode. I kept adjusting my workflow with this new tool and it has been stabilized for a month. I think it is time to talk about the new workflow for task/time management with Org-Mode. This blog post consists of four parts: the principles, the definitions, the workflows, and finally the implementations. 1 The Principles Principles remain valid no matter what the tool is....

October 31, 2020

From Evernote to Org-Mode

Since 2017, Evernote has been my productivity system for note-taking and task management. I thought it was my ultimate system to stick with. It has served me so well and I have even became a paid user. However, mentioned in the last post, I am pursuing more privacy in my digital life and Evernote becomes a loophole. This post talks about the privacy concern, my research on the alternatives, and the switch to Org-Mode....

September 3, 2020

Installing Arch Linux with Full Disk Encryption

I recently re-installed my Arch Linux with full disk encryption (FDE), as one of the first steps, to bring privacy into my life. This guide documents the installation process in a step-by-step manner. I hope this can help people who also want to practice privacy. Each step in this guide are linked to the corresponding ArchWiki, precised to section level. You are suggested to read these references and, of course, the official installation guide because...

July 29, 2020

Switching Windows in i3 Window Manager

3 years ago, I switched from Mac OS back to Linux. The main reason was i3wm — a tiling window manager for Linux — and its way to switch between windows. In this post, I am going to talk about how to switch windows on i3. But before that, let’s take a look at something we all know — Alt+Tab. The Ergonomics Problem with Alt+Tab Alt+Tab (or Command+Tab on Mac) is the most typical way to switch windows....

June 21, 2020