They call it hyperthymestic syndrome.

"Here's a woman who has very strong memories, but she has very strong memories of things for which I have no memory at all," McGaugh says.

That became particularly clear one day when he asked her out of the blue if she knew who Bing Crosby was.

"I wasn't sure she would know, because she's 40 and wasn't of the Bing Crosby era," he says.

But she did.

"Do you know where he died?" McGaugh asked.

"Oh yes, he died on a golf course in Spain," she answered, and provided the day of the week and the date when the crooner died.