More to think about

Why are files called files?
Can files contain other files? Is that what a zip file is?
Can a file be empty?
Can a file’s name be the empty string?
A file is generally the unit of organised data on a storage device. So… is an SMS message on your phone a file? If not, what is it? That is, how else can things like messages be stored?
How can the same picture of a cat be in cat.gif, cat.png, and cat.jpg? What’s the difference between them? Which one is “best”?
If you can make a file smaller by zipping it, why don’t we just zip all files again and again, until they are all… tiny?
What happens when you delete a file? What does securely deleting a file really mean?
Are symbolic links (sometimes called “aliases”) files?
Can you delete the directory that you are currently in?
Is it possible to accidentally delete all the files on your computer?
If a filename doesn’t have an extension, how can you find out what kind of file it is? What tools are available to help you? How do they work?