Question: who came up with the idea of density
[{'answer': 'Archimedes', 'provenance': [{'wikipedia_id': '8429', 'title': 'Density', 'start_paragraph_id': 9, 'start_character': 46, 'end_paragraph_id': 9, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '8429', 'title': 'Density', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 896, 'bleu_score': 0.986797956037998, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9121874403963953963}, 'section': 'Section::::History.\n'}]}]