CREATE TABLE table_14118521_1 (primary_payload_s_ VARCHAR, launch_date VARCHAR)

what's the primary payload(s) with launch date being july 8, 1994
SELECT primary_payload_s_ FROM table_14118521_1 WHERE launch_date = "July 8, 1994"
SELECT "primary_payload_s_" FROM "table_14118521_1" WHERE "July 8, 1994" = "launch_date"