Question: what did jerry yang and david filo develop
[{'answer': 'Yahoo !', 'provenance': [{'wikipedia_id': '5492831', 'title': 'History of Yahoo!', 'start_paragraph_id': 85, 'start_character': 20, 'end_paragraph_id': 85, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Marissa Mayer era (2012–present).\n'}]}, {'provenance': [{'wikipedia_id': '5492831', 'title': 'History of Yahoo!', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 437, 'bleu_score': 0.8830196055000891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6722896028465541121}, 'section': 'Section::::Abstract.'}]}]