More to think about

What is the smallest possible text file?
Are there any limits to how big a text file can be?
How does your computer know if a file is a text file or not?
What difference does it make if you use tabs or spaces to indent code?
Roughly how big is a text file that contains all the works of Shakespeare?
A large text file will often compress very efficiently (that is, it’s feasible to take a large file containing English prose and zip it to about 20% of its size) — why is text good for compression? (Or to put it another way: why are text files so inefficient?)
What’s the advantage of storing data in a text format if there are binary formats which are much more efficient?
SVG is an image file format that is a text file. Is it possible to store audio information in a text file?
What alternatives are there to UTF-8 encoding?
Is it possible to encrypt a plain text file such that it is still a text file?
Who decides what symbols are in Unicode?
What happens if you try to display a character that isn’t in the font you are using?
What character is ASCII code 0 (zero)? What is it used for?
The classic “hacker culture” editor war question: Which is best: emacs or vim?