Pakistani boy leads scientists to pain discovery By Patricia Reaney Wed Dec 13, 1:25 PM ET A young Pakistani street performer and members of three related families have enabled scientists to make a genetic breakthrough that could lead to more effective painkillers. During his short life, the unnamed boy never felt pain. He was a local celebrity in northern Pakistan where he astonished crowds by plunging knives through his arms and walking on burning coals. He died on his 14th birthday after jumping from a roof. By studying his case, and other individuals from families in the same clan, researchers...