Question: when did we first put a rover on mars
[{'answer': 'January 2004', 'provenance': [{'wikipedia_id': '426143', 'title': 'Exploration of Mars', 'start_paragraph_id': 30, 'start_character': 3, 'end_paragraph_id': 30, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Past and current missions.:Recent missions.\n'}]}, {'provenance': [{'wikipedia_id': '426143', 'title': 'Exploration of Mars', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 574, 'bleu_score': 0.8757614530955271, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13018961382018575549}, 'section': 'Section::::Past and current missions.:Recent missions.\n'}]}, {'provenance': [{'wikipedia_id': '426143', 'title': 'Exploration of Mars', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13018961382018575549}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '426143', 'title': 'Exploration of Mars', 'section': 'Section::::Past and current missions.:Recent missions.\n', 'start_paragraph_id': 30, 'end_paragraph_id': 30, 'meta': {'evidence_span': ['In January 2004, the NASA twin Mars Exploration Rovers named "Spirit" (MER-A) and "Opportunity" (MER-B) landed on the surface of Mars. Both have met and exceeded all their science objectives. Among the most significant scientific returns has been conclusive evidence that liquid water existed at some time in the past at both landing sites. Martian dust devils and windstorms have occasionally cleaned both rovers\' solar panels, and thus increased their lifespan. "Spirit" rover (MER-A) was active until 2010, when it stopped sending data because it got stuck in a sand dune and was unable to reorient itself to recharge its batteries.', 'In January 2004, the NASA twin Mars Exploration Rovers named "Spirit" (MER-A) and "Opportunity" (MER-B) landed on the surface of Mars. Both have met and exceeded all their science objectives', 'In January 2004, the NASA twin Mars Exploration Rovers named "Spirit" (MER-A) and "Opportunity" (MER-B) landed on the surface of Mars.']}}]}]