Question: who discovered that light was a particle and how
[{'answer': 'Einstein', 'provenance': [{'wikipedia_id': '33426', 'title': 'Wave–particle duality', 'start_paragraph_id': 1, 'start_character': 313, 'end_paragraph_id': 1, 'end_character': 321, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33426', 'title': 'Wave–particle duality', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 395, 'bleu_score': 0.870484347189944, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1241019064134275081}, 'section': "Section::::History.:Black-body radiation and Planck's law.\n"}]}]