Question: who discovered that the heart works like a pump
[{'answer': 'William Harvey', 'provenance': [{'wikipedia_id': '50203', 'title': 'William Harvey', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50203', 'title': 'William Harvey', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 544, 'bleu_score': 0.977397480575333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5621736268525910059}, 'section': 'Section::::Abstract.'}]}]