Question: who plays professor proton on big bang theory
[{'answer': 'Bob Newhart', 'provenance': [{'wikipedia_id': '145389', 'title': 'Bob Newhart', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '145389', 'title': 'Bob Newhart', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 801, 'bleu_score': 0.9423758475247941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13737920622279351400}, 'section': 'Section::::Abstract.'}]}]