Question: when was the last juvenile executed in the us
[{'answer': 'April 10 , 1959', 'provenance': [{'wikipedia_id': '14331272', 'title': 'Capital punishment for juveniles in the United States', 'start_paragraph_id': 4, 'start_character': 627, 'end_paragraph_id': 4, 'end_character': 642, 'bleu_score': 1.0, 'section': 'Section::::Pre-"Furman" history.\n'}]}, {'provenance': [{'wikipedia_id': '14331272', 'title': 'Capital punishment for juveniles in the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 741, 'bleu_score': 0.985764216565234, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3935756888139693333}, 'section': 'Section::::Pre-"Furman" history.\n'}]}]