Question: when was world vision founded and by whom
[{'answer': 'in 1950', 'provenance': [{'wikipedia_id': '622961', 'title': 'World Vision International', 'start_paragraph_id': 1, 'start_character': 249, 'end_paragraph_id': 1, 'end_character': 256, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'by Robert Pierce', 'provenance': [{'wikipedia_id': '622961', 'title': 'World Vision International', 'start_paragraph_id': 1, 'start_character': 257, 'end_paragraph_id': 1, 'end_character': 273, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '622961', 'title': 'World Vision International', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 539, 'bleu_score': 0.861643650528614, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6795666818233549539}, 'section': 'Section::::Abstract.'}]}]