  Some aspects of quantum properties of N=8 supergravity in four dimensions are
discussed for non-practitioners. At perturbative level, they include the Weyl
trace anomaly as well as composite duality anomalies, the latter being relevant
for perturbative finiteness. At non-perturbative level, we briefly review some
facts about extremal black holes, their Bekenstein-Hawking entropy and
attractor flows for single- and two-centered solutions.
