Description: [caption id="" align="aligncenter" width="408" caption="The skeleton of a Hyracotherium, a tiny horse that heralded one of the major evolutionary trends of the age of mammals - the move to grazing - from the National Museum of Natural History's new exhibit "Mammals in the Limelight," opening May 30, 1985, In the background is Robert Emry, Curator of fossil mammals in the
Description: [caption id="" align="aligncenter" width="424" caption="U.S. National Museum, May 3, 1917, seen from the National Mall, by Unknown photographer, Photographic print, Smithsonian Institution Archives, Record Unit 45, Box 79, Folder: 10, Neg. SIA2009-2203."][/caption] As part of my work as the historian for the history of the Smithsonian, I’ve been working for the past year on