Expanding Universe: slowdown or speedup?
  The kinematics and dynamic interpretation of the cosmological expansion is
reviewed in a widely accessible manner with emphasis on the acceleration
aspect. Virtually all the approaches that can in principle account for the
accelerated expansion of the Universe are reviewed, including dark energy as an
item in the energy budget of the Universe; modified Einstein equations; and, on
a fundamentally new level, the use of the holographic principle.
