Error loading player: No playable sources found
15:42
It's like chasing the shadow of a murderer - or trying to draw a sketch of a person that you might never see.
That's what looking for Dark Matter is like, according to the physicists at CERN's ATLAS experiment.
RAZOR's Neil Cairns speaks to the scientists who're using the Large Hadron Collider to look for something that we aren't totally sure even exists.