Question: where did the uranium on earth come from
[{'answer': 'supernovae', 'provenance': [{'wikipedia_id': '31743', 'title': 'Uranium', 'start_paragraph_id': 48, 'start_character': 149, 'end_paragraph_id': 48, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Occurrence.:Origin.\n'}]}, {'provenance': [{'wikipedia_id': '31743', 'title': 'Uranium', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 1121, 'bleu_score': 0.935484995783968, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4541678088350350734}, 'section': 'Section::::Occurrence.:Origin.\n'}]}]