Puck was a character in William Shakespeare's play A Midsummer Night's Dream, also known as Robin Goodfellow. A bit of a troublemaker in the play, he puts love-in-idleness juice on the eyes of Bottom[?] and then sticks an ass's head on him. He also sticks love-in-idleness in the eyes of the lovers.
... as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only zero ha ...