Question: when was the link between muscular contraction and electricity discovered
[{'answer': '1780', 'provenance': [{'wikipedia_id': '1110611', 'title': 'Muscle contraction', 'start_paragraph_id': 67, 'start_character': 3, 'end_paragraph_id': 67, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '1110611', 'title': 'Muscle contraction', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 283, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15932131337366105458}, 'section': 'Section::::History.\n'}]}]