Question: when were the remains of broken hill man discovered
[{'answer': 'June 17 , 1921'}, {'provenance': [{'wikipedia_id': '1661334', 'title': 'Homo rhodesiensis', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 582, 'bleu_score': 0.7590253429447401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8080050355719393482}, 'section': 'Section::::Fossils.\n'}]}]