Our experiences and our expectation and assumptions greatly influence how and what we perceive. In 1978-1985, of 486 known predictions, only 2 were true. Many demonstrations are not carefully controlled. Some of the most impressive demos have turned out to be fraud. Magic tricks can be passed off as paranormal.
Parapsychologists perform serious experiments on paranormal phenomenon.
After, they show the receiver 4 drawings and ask him to pick which is closest to which you thought of. By using the scientific method is possible to avoid problems of paranormal phenomena and to study them objectively. Body temperature follows a circadian rhythm. Rhythms are influenced by real clocks. Jetlag is easier if we fly west, which lengthens the day so it fits with our natural cycle.