Use a unit of time based on universal constants, like seconds, an earth year is roughly 31.5Ms.

Because you can’t store it, 5head.

Better to leak that to segfault, take this:
#define free(x)

Because they become invisible in LaTeX

The Spanish notation makes the parentheses around n-k obsolete, clearly saving one symbol in some formulas is worth introducing a new one in others.

The image is a cropped xkcd with the text replaced but the same joke.