Permissions
I just read an article in, Mac World UK, about file storage, defragging, and computer speed. Of course, the article indicated that MACs write files differently. So, they do not need to be defragged (unless you are writing a crap ton of video, audio, and image files to your disc - then, MAYBE doing it might help at some point). But it mentioned fixing permissions. I get how it's done, with the .bom file. But why/how do the permissions change from their original settings, in the first place. The article just said through NORMAL usage. What does that mean? What's actually going on inside my computer?
iMac, iOS 8.4.1, using safari