Question: who discovered positive and negative charges in atoms
[{'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': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 1430, 'bleu_score': 0.5129728686517521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 411028156771213187}, 'section': 'Section::::History.\n'}]}]