Electromagnetic force has an infinite range of interaction. It is considerably stronger than the gravitational and weak forces. The photon is the key particle of exchange for electromagnetic force. The Strong Nuclear Force The strong nuclear force operates over a very short range, but it is the strongest of the forces.
Thomas Holmes and Richard Rahe are 2 now famous psychiatrists who, in 1967, put forward the idea that there may be a link to stress and physical illness.
Dr. Edmond Locard (13 December 1877 â 4 April 1966) was a pioneer in forensic science who became known as the  Sherlock Holmes of France . He formulated the basic principle of forensic science: Every contact leaves a trace . This became known as Locard's exchange principle.