What is the title of the episode whose original airdate is April 23, 2010?
CREATE TABLE "table1_26982362_2" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_airdate" text,
  "production_code" text
);
SELECT "title" FROM "table1_26982362_2" WHERE "original_airdate"='April 23, 2010';