Question: who was the social psychology professor at yale who designed
[{'answer': 'small - world experiment', 'provenance': [{'wikipedia_id': '27628', 'title': 'Stanley Milgram', 'start_paragraph_id': 26, 'start_character': 70, 'end_paragraph_id': 26, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Small-world phenomenon.\n'}]}, {'provenance': [{'wikipedia_id': '27628', 'title': 'Stanley Milgram', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 559, 'bleu_score': 0.921097057494161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16791807696142617816}, 'section': 'Section::::Abstract.'}]}]