Binary representation of numbers and floating point precision arithmetic.
Once upon a time, I absolutely despised matlab. In my own spoiled preconceptions, I believed that matlab was designed without a single shred of care as to how ugly it is. Of course, I eventually had to finally write my first line of matlab and, upon discovering that I’m still in one piece, concluded that matlab wasn’t really that bad. Anyways, I’ve moved onto grander things now, things such as singing obnoxiously in public, browsing reddit for hours on end, and Python.