The strength of that signal can be correlated with the mass from the galaxies in the cluster, because a larger cluster will trap more hot gas. But it is not a precise the relationship. "That's the biggest source of error, Says louis Bartlett, A cosmologist at the University of Paris Diderot who is part of the Planck effort.

He also found that provocation can cause inhibition in complex functions like language, As applying a current to the areas followed by speech production in the left hemisphere while the patient is engaged in speech serves to disrupt this behaviour (Penfield, 1963). this process is performed during surgery }