<p><b>The perfect Mother''s Day gift: A collection of witty one-line advice <i>New Yorker </i>writer Patricia Marx heard from her mother, accompanied by full-color illustrations by<i> New Yorker</i> staff cartoonist Roz Chast.</b><br><br>Every mother knows best, but <i>New Yorker </i>writer Patty Marx''s knows better. Patty has never been able to shake her mother''s one-line witticisms from her brain, so she''s collected them into a book, accompanied by full color illustrations by <i>New Yorker </i>staff cartoonist Roz Chast. These snappy maternal cautions include: <br><br><i>If you feel guilty about throwing away leftovers, put them in the back of your refrigerator for five days and then throw them out.</i><br><br><i>If you run out of food at your dinner party, the world will end. </i><br><br><i>When traveling, call the hotel from the airport to say there aren''t enough towels in your room and, by the way, you''d like a room with a better view.</i><br><br><i>Why don''t you write my eu