Question: who discovered that most of an atom is empty space
[{'answer': 'Rutherford', 'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 1, 'start_character': 48, 'end_paragraph_id': 1, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 247, 'bleu_score': 0.9164531641034831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11799408222330350965}, 'section': 'Section::::Summary.:The outcome of the experiments.\n'}]}]