  The `Little Bangs' made in particle collider experiments reproduce the
conditions in the Big Bang when the age of the Universe was a fraction of a
second. It is thought that matter was generated, the structures in the Universe
were formed and cold dark matter froze out during this very early epoch when
the equation of state of the Universe was dominated by the quark-gluon plasma
(QGP). Future Little Bangs may reveal the mechanism of matter generation and
the nature of cold dark matter. Knowledge of the QGP will be an essential
ingredient in quantitative understanding of the very early Universe.
