I have on two occasions had a very strong feeling that friends were seriously ill, long before the illness was diagnosed. In both cases it was true; one died, one survived. In neither case would they have paid the slightest attention to me if I had said anything--there were no real symptoms. Meanwhile, two other friends have also had serious illnesses, with the same result--one died, one survived. I had no clue in either case that anything was wrong prior to medical diagnosis. I can only conclude that it must work something like radio signals--I can pick things up from some people, but not from others. My husband and daughter are almost mysteries to me, even to the exent of gauging their moods, but my son is an open book. Go figure.

The same kind of thing probably applies to readers of Tarot cards or other prediction devices--some people are more sensitive than others, just like other abilities differ from person to person.