user: Question: what's the primary payload(s) with launch date being July 8, 1994
Columns: ['EDO Flight', 'Shuttle', 'Mission', 'Launch Date', 'Duration', 'Primary Payload(s)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Columbia', 'STS-50', 'June 25, 1992', '13 days, 19 hours, 30 minutes, 4 seconds', 'United States Microgravity Laboratory-1']
SQL:

assistant: SELECT "Primary Payload(s)" FROM "Table" WHERE "Launch Date" = 'July 8, 1994';