Question: who is the inventor of post it notes
[{'answer': 'Dr. Spencer Silver', 'provenance': [{'wikipedia_id': '598223', 'title': 'Post-it Note', 'start_paragraph_id': 4, 'start_character': 9, 'end_paragraph_id': 4, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '598223', 'title': 'Post-it Note', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 732, 'bleu_score': 0.9438821575406341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11081506620015948207}, 'section': 'Section::::History.\n'}]}]