In this video, Laurie Santos pulls a switcheroo on her monkey research subjects. Will they notice when a fruit that starts rolling down a plank as a kiwi reaches the bottom as a lime?

A new study looked at how macaque monkeys respond to other monkeys’ efforts at communication in the form of drumming or vocalizing.

For John Shea, the way we posed our questions about the human spark got him pondering the evolution of our human uniqueness in a new way.

A new study suggests that chimpanzees do help out other chimps – but are much more likely to help if the chimp in need basically asks for it.

Scientists are attacking the question of how we became human from a number of new directions – in addition to analyzing the evidence of ancient fossils.

Check out this video to learn more about Lisa Parr's studies on chimp emotions and what these studies can tell us about the human spark.

Alan enters the lab at Yerkes hoping to learn about chimpanzees and facial recognition. But instead, the chimps show Alan and the crew who's boss.

Psychologist Vicky Horner discusses research into chimpanzee cultural transmission. Do chimps have "culture" like humans?

Dan Gilbert and Alan Alda discuss whether animals have the ability to "prospect," or plan ahead.

The media has jumped all over this beautifully preserved 47-million-year-old fossil, with some even calling it a “missing link.” What do you think?