Patrick and Jan Cockburn pictured with their son Henry. Ever since he was a child, Henry was "intensely alive and interested in everything and everybody around him," says his father. Courtesy of Patrick Cockburn/ Scribner hide caption

itoggle caption Courtesy of Patrick Cockburn/ Scribner

Even basic sensory maps in the brain can be remapped in a matter of months, says neurologist V.S. Ramachandran. Mads Abildgaard/iStockphoto.com hide caption

itoggle caption Mads Abildgaard/iStockphoto.com

A hormone that impacts memory in rats likely does the same thing in other animals, like humans. S. Ugur Okcu/iStockphoto.com hide caption

itoggle caption S. Ugur Okcu/iStockphoto.com