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The Mechanical Universe

Draw with your finger


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Learn Assembly Language Programming on Raspberry Pi 400
One of the easiest ways to learn assembly language programming is on the Raspberry Pi 400. The Raspberry Pi 400 is a complete personal computer built into a compact keyboard. More ...

Area of an Ellipse Calculator
It's easy to calculate the area of an ellipse because it's similar to calculating the area of a circle ecept instead of Pi times the radius squared, its Pi times the long axis times the short axis. More ...

Inkscape Preferences
Inkscape is a highly configurable application. Many of these configuration options can be set through the Preferences dialog box. There is probably a hundred things you can configure through the Preferences dialog box. Here I'll describe a couple of the most important ones. More ...

Area of a Triangle Calculator
There are three different methods to calculate the area of a triangle depending upon what information you have about the triangle. This application combines all three. More ...

EMI, RFI, EMC, EMS, What's the Difference?
EMI, RFI, EMC, and EMS all refer to different aspects of radio frequency interference which may cause elecronic devices to malfunction. Correcting these problems can be an art and a science. More ...

The Power of a Positive Attitude
One of the most important personality traits required for the achievement of a successful life is a positive attitude. What I mean when I say positive attitude might be more accurately described as a realistic attitude. More ...

Windows 10 Shortcut to Turn Laptop Camera On or Off
To prevent hackers from sneaking a look at you, turn your laptop camera off. This article shows you how to place a shortcut on your desktop that you can use to quickly turn your laptop camera on or off. More ...

Introduction to Operating Systems
An operating system is software that acts as an intermediary between a computer user and the computer's applications and hardware. An operating system can be viewed as a resource allocator. Resources might be CPU time, memory space, file storage space, and input/output (I/O) devices. More ...

Export Inkscape Drawing as an Image
Although Inkscape images can be embedded in webpages, for most other applications you'll need a raster image format. Inkscape can export your drawing in the .png raster image format. More ...

The Evolution of Hard Disk Bit Recording
Hard drive technology has continuously improved over the decades, that includes higher storage capacity performance. Part of this improvement has been higher access speeds, but most of the higher storage capacity has been the result of changes in the bit recording methods. More ...

Inkscape Exercise: Draw Photorealistic Sphere
Although Inkscape is a 2D drawing application, it is quite capable of drawing photorealistic 3D images. To demonstrate this capability, in this article I show you, step-by-step how to draw a photorealistic sphere. More ...

Fundamentals of Windows Security
Today, criminals are more sophisticated, and groups have formed with significant financial backing to support the wrong doings of these groups. This book is for system administrators, cybersecurity and technology professionals, solutions architects, or anyone interested in learning how to secure their Windows-based systems. More ...

Regular Expressions Intervals
Regular expression intervals tell us about the number of occurrences of a character in a string. Curly braces are used to define a precise count of how many occurrences you are checking for. More ...

Easy CSS 3D Mouse-over Pressed Text Effect
I provide easy CSS code for 3d text when you move your mouse pointer over the 3D text shown above, the text will appear to be pressed. In this example, I configured the 3d text in a link. More ...

JavaScript to Copy and Paste Text to the Clipboard
In some applications, rather than the user's selection, you may want to copy the contents of a specific html element to the clip board. Or when the user initiates a Paste, you may want to direct the contents of the user's clipboard to a specific html element on the webpage. Here is the code for this. More ...

Self-Esteem and Success
A person with high self-esteem believes that they are a worthwhile and important person. A person with low self-esteem believes that others are better than them, and that they deserve to treated badly by others. More ...


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