I was extremely disappointed to learn that the dinosaur exhibit at the National Museum of Natural History will be closed for five years [“It’s not an extinction event, just a remodeling,” front page, Jan. 18]. My only hope is that the Smithsonian doesn’t make the same mistakes it made when it remodeled the National Museum of American History a few years ago. That renovation proved that change does not always equal improvement.

Michael Kiffney, Vienna