CREATE TABLE "table1_14835674_1" (
  "episode_num" real,
  "the_w_rd" text,
  "guest" text,
  "introductory_phrase" text,
  "original_airdate" text,
  "production_code" real
);

Question: What was the inroductory phase for the episode with production code 4005?
SQL: SELECT "introductory_phrase" FROM "table1_14835674_1" WHERE "production_code"=4005;

Question: What was the inroductory phase for the episode with neil shubin as a guest?
SQL: SELECT "introductory_phrase" FROM "table1_14835674_1" WHERE "guest"='Neil Shubin';

Question: What was the inroductory phase for the episode that originally aired january 21?
SQL: SELECT "introductory_phrase" FROM "table1_14835674_1" WHERE "original_airdate"='January 21';