My supervisor always finds fault with my work.

Prehistoric artists used hand-prints in cave paintings, perhaps as a 'signature'. They might be considered the earliest example of a biometric identifier.

That is, it is necessary to check whether a run is Zeno so as to avoid presenting Zeno runs as counterexamples.

The parenting magazines are on a higher moral plane than the how-to-get-a-guy magazines, just as a man going home to his wife and children (or a woman breast-feeding a baby) is on a higher moral plane than a man out trolling for nookie (or a woman flexing her Kegels in preparation for a date).