Question: when does between shades of gray take place
[{'answer': 'mid-20th century', 'provenance': [{'wikipedia_id': '33702117', 'title': 'Between Shades of Gray', 'start_paragraph_id': 1, 'start_character': 154, 'end_paragraph_id': 1, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33702117', 'title': 'Between Shades of Gray', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 438, 'bleu_score': 0.9408228243926111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4331726262267338489}, 'section': 'Section::::Abstract.'}]}]