James Brown's Personal Blog

Articles and Information
The following articles include basic information about how to solder and what tools you need. Many of these include videos and links to other resources.
How To Solder: A Complete Beginners Guide - Makerspaces.com

Sometimes the data in your SQL database represents hierarchical data. For example, a bill of materials, departments, or reporting structures (employee directory).
You may not know it, but you can actually do fully recursive queries directly in SQL using common table expressions (CTEs).  I wrote up a github 'gist' including example data and SQL code to demonstrate how to do this....

Overview
mCore board
The great folks over at Makeblock have created a nice little board for creating robots, the mCore.

Internet sales tax just makes no sense.  It is simply another version of interstate sales tax which also makes no sense.  The simple solution is to pay sales tax where an item is sold (it is called "Sales Tax" after all) and be done with it.
Let's look at the edge cases which are often instructive in revealing issues and problems....