CREATE TABLE table_76219 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Original air date" CLOB)

Which Original air date has a Season # smaller than 21, and a Title of 'palimpsest'?
SELECT "Original air date" FROM table_76219 WHERE "Season #" < '21' AND "Title" = 'palimpsest'
SELECT "Original air date" FROM "table_76219" WHERE "Season #" < '21' AND "Title" = 'palimpsest'