Some simple rules for good typography. One interesting one:
[T]he first two Fibonacci numbers are 0 and 1 and each other number is a combination of the previous 2. These numbers are meant to have a natural visual elegance to each other. Since the Renaissance, many artists and architects have proportioned their works to approximate the ‘golden ratio’…[I]n typography it is a good suggestion to consider using only these numbers to structure your chosen point sizes to. It will give your whole document a natural elegance.
0 1 1 2 3 5 8 13 21 34 55 89 144…
When writing a paper or, really, anything with text, it’s useful to have a good knowledge of typography; elegance helps people more easily understand the message.