Get real page source

Nowadays with all these javascript frameworks if you just do a view page source, you will only get the skeleton app div with a bunch of script tags. To see the expanded real page source, type in the following in the web console.


That will copy the computed dom to your clipboard, then you just need to paste it to your text editor. You will see all the other dom nodes which the js files added to the app div.


Watch these videos before looking for a new car

Kevin Hunter, who worked at car dealerships before, gives the inside scoop of what’s happening at the car dealerships. I have experienced a few things he talked about in the past. These videos are definitely worth watching before heading to the car dealerships.

Personal information price tag

Here is a nice blog post on how much things related to personal information (e.g. credit cards, driver license, etc) are sold on the dark web.

Financial Statements

Here is a nice tutorial on financial statements.

Format a USB stick

There are times Disk Utility cannot help you. Then you know it is time to turn to the command line.

sudo diskutil list
sudo diskutil eraseDisk FAT32 NEW_DISK_NAME /dev/disk3

Make sure /dev/disk3 is indeed the usb drive, go through the drive list from the result of the first command to make sure.

FAT32 is the file system you want to use on the usb drive. And NEW_DISK_NAME is the usb stick volume name. If you pick say myDrive, and you get the error myDrive does not appear to be a valid volume name for its file system, simply use uppercase characters, e.g. MYDRIVE, that will help you move forward. You can rename it later after formatting it.

I converted my unreadable USB drive from

/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        *7.8 GB     disk3
   1:        Apple_partition_map                         4.1 KB     disk3s1
   2:                  Apple_HFS                         2.4 MB     disk3s2


/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *7.8 GB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:       Microsoft Basic Data NEW_DISK                7.6 GB     disk3s2


How to Erase a Disk from Command Line in Mac OS X


Nice tutorials

Total Compensation Calculator

This calculator is so handy!

COVID-19 Vaccine Tracker

Here is a website to track the vaccine progress.

Create diagrams with code

Graphviz is powerful! It can visualize dependency with input from code, that means we can programmatically generate visual output.

digraph MyGraph {
  a -> b
  b -> c
  a -> d
  a -> c



Monty Hall Problem

Interesting brain teaser.

Suppose you’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what’s behind the doors, opens another door, say No. 3, which has a goat. He then says to you, “Do you want to pick door No. 2?” Is it to your advantage to switch your choice?