Scratching an itch can bring a contradictory wave of pleasure and misery. A mouse study on scratching, reported in the Jan. 31 Science, fleshes out this head-scratching paradox and could point out ...

Medical science has deciphered many of the body’s workings, down to the level of the gene, and isn’t too far from using stem cells to repair its hobbled organs. But in many ways, the human body ...