Question: who proved that heavy and light objects fall at the same speed
[{'answer': 'Galileo Galilei', 'provenance': [{'wikipedia_id': '8738092', 'title': "Galileo's Leaning Tower of Pisa experiment", 'start_paragraph_id': 1, 'start_character': 39, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8738092', 'title': "Galileo's Leaning Tower of Pisa experiment", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 373, 'bleu_score': 0.9199732720441991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2811548119309335530}, 'section': 'Section::::Abstract.'}]}]