An 83-year-old woman in Pennsylvania said she had her father’s arm in the basement.

Oh yeah, Doran Cart wanted it.

It was a prosthetic limb once used by an American soldier wounded in battle during the First World War.

“We didn’t have anything like this in the collection,” said Cart, senior curator at the National World War I Museum at Liberty Memorial. “It’s a personal item. It shows the humanity and the remnants of war.”...