Question: who experimented with oil and water layers in 1917
[{'answer': 'Dr. Irving Langmuir', 'provenance': [{'wikipedia_id': '1884175', 'title': 'Langmuir–Blodgett trough', 'start_paragraph_id': 4, 'start_character': 81, 'end_paragraph_id': 4, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Description.:Overview.\n'}]}, {'provenance': [{'wikipedia_id': '1884175', 'title': 'Langmuir–Blodgett trough', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1528, 'bleu_score': 0.9917182482576091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7771586484708734041}, 'section': 'Section::::Description.:Overview.\n'}]}]