The human difference? Perhaps the humanities: fluid language and historical sensibility. From the article:

The first astonishing fact is that we can speak at all, of course. No matter what you’ve been thinking and feeling throughout the day, you will be able to find words to express the experience and describe it to those around you. No other creature can communicate with such freedom…. Together with language, mental ‘time travel’ allows us to share our experiences and our hopes with many other people, building networks of combined knowledge that are continually growing with each generation. Science, architecture, technology, writing – in short, everything that allows you to read this article – would be impossible without it.