Question: The Derwitzer Glider was a glider that was developed by Otto Lilienthal, a German pioneer of aviation who became known as the "flying man", and on which date, his glider stalled and he was unable to regain control?
{'answer': '9 August 1896', 'supporting_facts': [['Derwitzer Glider', 0], ['Otto Lilienthal', 3]]}