Question: when did the smithsonian air and space museum open
[{'answer': '1976', 'provenance': [{'wikipedia_id': '221550', 'title': 'National Air and Space Museum', 'start_paragraph_id': 1, 'start_character': 263, 'end_paragraph_id': 1, 'end_character': 267, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '221550', 'title': 'National Air and Space Museum', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 651, 'bleu_score': 0.8301002571209161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8373793604335416138}, 'section': 'Section::::Abstract.'}]}]