Question: what happened at the 1939 worlds fair in regards to television
[{'answer': 'Television demonstrations are held', 'provenance': [{'wikipedia_id': '170891', 'title': '1939 in television', 'start_paragraph_id': 7, 'start_character': 12, 'end_paragraph_id': 7, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Events.\n'}]}, {'provenance': [{'wikipedia_id': '170891', 'title': '1939 in television', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 212, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7603757514978970082}, 'section': 'Section::::Events.\n'}]}, {'provenance': [{'wikipedia_id': '170891', 'title': '1939 in television', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 157, 'bleu_score': 0.9181891462193901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7603757514978970082}, 'section': 'Section::::Events.\n'}]}, {'provenance': [{'wikipedia_id': '170891', 'title': '1939 in television', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7603757514978970082}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '170891', 'title': '1939 in television', 'section': 'Section::::Events.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ["Television demonstrations are held at the 1939 New York World's Fair on Long Island", "BULLET::::- Television demonstrations are held at the 1939 New York World's Fair on Long Island and the Golden Gate International Exhibition in San Francisco.\rhighlight sentence(s) containing evidence, not only the answer"]}}]}]