The use of heading is bad, because:

If you use <math></math> tags, it will mess up the toc:

Fractions are even worse:Well at least:4 \pi(r^3)⁄3

Or 4\pi(r^3)⁄3

Something else that is bad

==============Attempted level 20 heading, but i could only have level 6 with 14 pairs of equal signs shown==============

This shows why you shall never use headings

Navboxes can’t go on it apparently

This essay is too short, because it only has headings. Please do not add stuff outside the headings.