Crows are notoriously clever — the songbirds can use tools, understand the concept of zero and follow basic analogies. Now, a new study suggests that their grasp of one complex cognitive principle in ...

An aptitude for mentally stringing together related items, often cited as a hallmark of human language, may have deep roots in primate evolution, a new study suggests. But “this work shows that the ...

Among the sublime concepts that humans grasp intuitively is the concept of recursion, where something contains a kind of repetition of itself stretching out to infinity. Any "movie within a movie" ...

Timmy and Tommy are having a counting contest. “One,” says Timmy. “Two,” says Tommy. “Three,” Timmy replies. “Four,” Tommy responds. Timmy pauses. He can’t think of a higher number, and neither can ...