Technology

Lynne Teaches Tech: Why does compressing a JPEG make it look worse, even though putting in a ZIP file makes it look the same?

Last Updated on May 5, 2019there are many different methods of file compression. one of the simplest methods is run length encoding (RLE). the idea is simple: say you have a file like this:aaabbbbaaaaayou could store it as:a3b4a5to represent that there are 3 a’s, 4 b’s, etc. you would then… Read More »Lynne Teaches Tech: Why does compressing a JPEG make it look worse, even though putting in a ZIP file makes it look the same?

Lynne Teaches Tech: why don’t windows programs work on a mac, and vice versa?

Last Updated on May 5, 2019an operating system (OS), such as windows or macOS, handles a lot of low-level stuff. this means that developers don’t have to worry about details like “how to scroll a page” or “how to read text from a file”, because the OS handles it for… Read More »Lynne Teaches Tech: why don’t windows programs work on a mac, and vice versa?

Lynne Teaches Tech: what is the “analogue loophole”?

Last Updated on May 5, 2019the “analogue loophole” (or the analog loophole) refers to the idea that no matter how hard you try to make sure nobody can make illegal copies of videos, music, or text, there’s always a “hole” in the protection that occurs when it’s no longer digital.… Read More »Lynne Teaches Tech: what is the “analogue loophole”?

Lynne Teaches Tech: What does “decentralised” mean?

Last Updated on May 5, 2019Let’s use twitter and mastodon for our examples.Twitter is centralised, while Mastodon is not. This means that it’s possible for Twitter to disappear at any time – the CEO could (theoretically) shut it down and delete anything at a moment’s notice. The company behind twitter… Read More »Lynne Teaches Tech: What does “decentralised” mean?

Lynne Teaches Tech: what is “free software”? why do people say software isn’t free, even though you can download it for free from the app store?

Last Updated on May 18, 2019there are a lot of ways you could define “free software”. for example, you could say candy crush or CCleaner is free software, because you can install it for free. when people say that software is “free as in freedom”, or “libre”, they mean something… Read More »Lynne Teaches Tech: what is “free software”? why do people say software isn’t free, even though you can download it for free from the app store?

Lynne Teaches Tech: Why do people say GNU/Linux or GNU+Linux?

Last Updated on May 5, 2019paraphrased Wikipedia quote:In 1991, the Linux kernel appeared. Combined with the operating system utilities developed by the GNU project, it allowed for the first operating system that was free software, commonly known as Linux. in other words, the linux kernel and GNU utilities work together… Read More »Lynne Teaches Tech: Why do people say GNU/Linux or GNU+Linux?