feature of today’s crossword -- MINDYOUR P SAND Q S (60A “Behave!” … and a hint to this puzzle’s theme); P ERSONALITY Q UIZ (17A Cosmopolitan staple ); P RO Q UARTERBACK (26A N.F.L. star ); and P ATCHWORK Q UILT (47A Colorful bed cover ). “Mind your P’s and Q’s”