Many things in nature seem to be striving for a purpose — the carefully choreographed flocking of birds is an example. Are these birds smart enough to follow a common goal or is the apparent purpose an illusion? Find out with these articles. (Photo: Walter Baxter.)
Machine learning is the most important recent development in artificial intelligence. Find out how it works, what it can do, where it comes from and whether it's ethical with this collection of articles.
Physics is all about observation, but how much can we actually see? We explore some of the limits of observation — be they natural, scientific, political, or down to the fuzzy quantum nature of reality.