Apes can tell when humans don’t know something For years, researchers believed that only humans had the ability to recognize when others lacked information. This skill, called "theory of mind," enables humans to communicate, teach, and collaborate in complex ways. It was widely thought that animals, including apes, did not possess this ability. However, new research from Johns Hopkins University challenges that idea. The experts found that apes actively pointed out hidden treats to humans who did not know where they were. This seemingly simple action suggests that apes understand when...