  In this article, we provide and overview of what we consider to be some of
the most pressing research questions facing the fields of artificial
intelligence (AI) and computational intelligence (CI); with the latter focusing
on algorithms that are inspired by various natural phenomena. We demarcate
these questions using five unique Rs - namely, (i) rationalizability, (ii)
resilience, (iii) reproducibility, (iv) realism, and (v) responsibility.
Notably, just as air serves as the basic element of biological life, the term
AIR5 - cumulatively referring to the five aforementioned Rs - is introduced
herein to mark some of the basic elements of artificial life (supporting the
sustained growth of AI and CI). A brief summary of each of the Rs is presented,
highlighting their relevance as pillars of future research in this arena.
