Question: who were the greek philosophers who contributed the basic information about atoms
[{'answer': 'Democritus', 'provenance': [{'wikipedia_id': '8211', 'title': 'Democritus', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'his mentor Leucippus', 'provenance': [{'wikipedia_id': '8211', 'title': 'Democritus', 'start_paragraph_id': 2, 'start_character': 176, 'end_paragraph_id': 2, 'end_character': 196, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8211', 'title': 'Democritus', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 533, 'bleu_score': 0.556277841251496, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 657236664463317956}, 'section': 'Section::::Abstract.'}]}]