One of life's pleasures is scratching an itch!
That's because itching activates pleasure centres in the brain, and this can trigger further, purely gratuitous, hedonistic scratching too.
Diana Bautista of the Department of Molecular & Cell Biology at the University of California, Berkeley studies itching, scratching and what they can tell us.
Photo: (Flickr user Lee J Haywood) (CC BY-SA 2.0)
Gorilla Scratching Head Photo: (Flickr user Eric Kilby CC BY-SA 2.0)
