The Maxwell's demon of star clusters
  Stellar binaries are the most important energy reservoir of star clusters.
Via three-body encounters, binaries can reverse the core collapse and prevent a
star cluster from reaching equipartition. Moreover, binaries are essential for
the formation of stellar exotica, such as blue straggler stars,
intermediate-mass black holes and massive ($\gtrsim{}30$ M$_\odot$) black hole
binaries.
