Question: who wrote the equation for the law of gravitation
[{'answer': 'Isaac Newton', 'provenance': [{'wikipedia_id': '244611', 'title': "Newton's law of universal gravitation", 'start_paragraph_id': 1, 'start_character': 341, 'end_paragraph_id': 1, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '244611', 'title': "Newton's law of universal gravitation", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 724, 'bleu_score': 0.8945861581268421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6951807918310260569}, 'section': 'Section::::Abstract.'}]}]