NaturalReasoning: Reasoning in the Wild with 2.8M Challenging Questions - Yuan, Weizhe; Yu, Jane; Jiang, Song; Padthe, Karthik; Li, Yang; Wang, Dong; Kulikov, Ilia; Cho, Kyunghyun; Tian, Yuandong; Weston, Jason; Li, Xian (Advances in Neural Information Processing Systems, 2025)