Self-tutoring about PHP: the tutor mentions its exponent operator. In PHP, 32 is 3**2. This seems to work unless the base is negative. For instance, 2.6**2.9 and 10**(-2/3) will come out correctly, but (-8)**(1/3) won’t, in my experience. Source:

Self-tutoring about web effects: the tutor mentions mirror text. Hello, world! I’ve been told being able to write so you can read it in a mirror is a rare skill. Well, CSS has you covered, with transform: scale(-1,1) Source: