{"threads": [{"title": "NASA's Mars 2020 rover will seek signs of ancient life", "articles": ["8257973864075507399.html", "613467574239603663.html", "2676996512558235903.html", "7770110437022144354.html", "3476726122967187601.html", "653399570027282176.html", "8975941550028674809.html"]}]}