Many people believe that a virgin could still be a virgin before, during and after childbirth; or that in the coffee grounds one can read the future; or that in the geometric drawings of the stars in the night sky our destiny can be read; or that infinitesimal quantities tending to zero of dissolved substances can cure all kinds of illnesses... But noboday has evidence on this. A belief is not science. In order to be so, it must be proved.

This conference will be given by Manuel Toharia, physicist and scientific disseminator.