Scientists discovered that a little-known group of ancient people, the Denisovans, may predate the Neanderthals at a site important to the story of humankind.
I. Arapakis, X. Bai, and B. Cambazoglu. Proceedings of the 37th international ACM SIGIR conference on Research &$\mathsemicolon$ development in information retrieval, ACM, (July 2014)