Question: how long do gliders stay in the air
[{'answer': 'can stay airborne for hours', 'provenance': [{'wikipedia_id': '21491527', 'title': 'Gliding', 'start_paragraph_id': 15, 'start_character': 14, 'end_paragraph_id': 15, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Soaring.\n'}]}, {'provenance': [{'wikipedia_id': '21491527', 'title': 'Gliding', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 167, 'bleu_score': 0.7063511896022441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4933657129023204119}, 'section': 'Section::::Soaring.\n'}]}]