There are many people who can "read" our facial expresions or pick up on the "use" of our words or expresions and use it to their advantage such as salemen who are taught or learn some of these techniques to increase there profitibility and enhance the merchandise appealability to the customer.Just watch QVC or other sales channels to see the techniques employed or even the gypsy Rosey Lee`s of this world.
As to real world do not confuse the ability to "see" with the world of religion or the "spirit world"[if there is such a thing] they are different kettles of fish altogether.
One last thought if it were true,think long and hard,would you think it a gift or a burden to be born with such insight if such a thing were to be true?