CREATE TABLE table_64669 ("Year" FLOAT, "Tournament" TEXT, "Venue" TEXT, "Discipline" TEXT, "Result" TEXT, "Extra" TEXT)

What is the extra when the result is 4th at the NCAA Championships?
SELECT "Extra" FROM table_64669 WHERE "Result" = '4th' AND "Tournament" = 'ncaa championships'
SELECT "Extra" FROM "table_64669" WHERE "Result" = '4th' AND "Tournament" = 'ncaa championships'