non-verbal communication

the non-verbal communication is essential as 90% of the meaning of the message that is wanted to be transfer becomes from the physical and facial expressions made while speaking to other people, it could change the meaning of the same sentence depending on the tone of voice, facial expressions and more things to a whole different message than the one that is wanted to give. these expressions are involuntary movements from our body that cannot be handled by will most of the time thats why is so important when trying to find if someone is lying or not.