Question: who discovered the atom is mostly empty space
[{'answer': 'Geiger and Marsden', 'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 12, 'start_character': 24, 'end_paragraph_id': 12, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Summary.:The outcome of the experiments.\n'}]}, {'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 447, 'bleu_score': 0.8368062693539421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11094933242606172010}, 'section': 'Section::::Summary.:The outcome of the experiments.\n'}]}]