NPR&#x27;s Alex Chadwick in an ape nest - Researchers have long wondered about a large primate skull found a century ago in the northern Congo. Gorillas have never been reported in this region. But there are stories of very large apes -- and recent evidence suggests that something unknown may be there.   Intrigued by the possible existence of a new species of ape -- news that would rock the world of science -- some of the most renowned ape researchers in the world agreed to undertake an…