Peter Henrikson, 61, a timber framer from Minnesota, measures a beam, part of the new roof of the Notre Dame cathedral de Paris, Thursday, May, 25, 2023, near Angers, western France. Carpenters building a new timber frame for the fire-ravaged roof of Paris' Notre Dame Cathedral are using the same tools and techniques as their medieval predecessors. For them, working with hand-axes to fashion oak beams has been like stepping back in time. (AP Photo/Jeffrey Schaeffer)