Question: who was the richest man in the world in 1970
[{'answer': 'Howard Hughes', 'provenance': [{'wikipedia_id': '24968372', 'title': 'List of richest Americans in history', 'start_paragraph_id': 24, 'start_character': 12, 'end_paragraph_id': 24, 'end_character': 25, 'bleu_score': 1.0, 'section': "Section::::Fortune's Wealthiest Americans (1957).\n"}]}]