Question: who was the first scientist who produced electromagnetic waves in a laboratory
[{'answer': 'Heinrich Rudolf Hertz', 'provenance': [{'wikipedia_id': '13445', 'title': 'Heinrich Hertz', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13445', 'title': 'Heinrich Hertz', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 301, 'bleu_score': 0.8879659171421961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6148999597811518146}, 'section': 'Section::::Abstract.'}]}]