Recent findings about the capabilities of smart animals such as corvids or octopi and novel
types of artificial intelligence (AI) from social robots to cognitive assistants are
provoking the demand for new answers for meaningful comparison with other kinds of
intelligence. This book fills this need by proposing a universal theory of intelligence which
is based on causal learning as the central theme of intelligence. The goal is not just to
describe but mainly to explain queries like why one kind of intelligence is more intelligent
than another whatsoever the intelligence. Shiny terms like strong AI superintelligence
singularity or artificial general intelligence that have been coined by a Babylonian confusion
of tongues are clarified on the way.