Question: who came up with positive and negative charges
[{'answer': 'Michael Faraday', 'provenance': [{'wikipedia_id': '9804', 'title': 'Electric charge', 'start_paragraph_id': 6, 'start_character': 347, 'end_paragraph_id': 6, 'end_character': 362, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '9804', 'title': 'Electric charge', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 781, 'bleu_score': 0.933002475586681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9346168738648300170}, 'section': 'Section::::Overview.\n'}]}]