Dark energy is easy enough to understand- even experience (if you life in Canada this time of year).
go to a window, crack it open. feel that knife of cold clearly entering your arm, right to your bone? A physicist will tell you "you are really feeling the heat flowing away from your arm", but you distinctly feel a definite flow inward.
== dark energy. For, as wise man once said "For ever flow of thermodynamic energy, there is an equal and opposite flow"
