A CRITIC'S LIFE...The always-entertaining and erudite Jonathan Yardley gives an appropriately appreciative review to Ruth Reichl's new book Garlic and Sapphires: The Secret Life of a Critic in Disguise. Now editor of Gourmet, Reichl was once the New York Times food critic, and she will join Extension 720 to discuss life in the gourmand's trenches on April 21.