CREATE TABLE table_72691 ("Date" CLOB, "Cover model" CLOB, "Centerfold model" CLOB, "Interview subject" CLOB, "20 Questions" CLOB, "Pictorials" CLOB)

Who was the on the cover when Bob Vila did the 20 Questions?
SELECT "Cover model" FROM table_72691 WHERE "20 Questions" = 'Bob Vila'
SELECT "Cover model" FROM "table_72691" WHERE "20 Questions" = 'Bob Vila'