CREATE TABLE table_29519 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

List the series number with the espide called 'shock waves'.
SELECT "No. in series" FROM table_29519 WHERE "Title" = 'Shock Waves'
SELECT "No. in series" FROM "table_29519" WHERE "Title" = 'Shock Waves'