Description: The term “personal equation” came into use in the 19th century as scientists found that observers have inherent biases: some anticipate events, and some report events after they have occurred. Recognition of the problem led to a spate of personal equation instruments: some measured biases of this sort, and some reduced the effect of personal errors. Most of these
Description: [caption id="attachment_11359" align="aligncenter" width="368" caption="Freelon Adjaye Bond/SmithGroup Design for the Smithsonian's National Museum of African American History and Culture (NMAAHC), Courtesy NMAAHC."][/caption] The Smithsonian Institution Archives will be celebrating African American History Month throughout February with a series of related posts on THE BIGGER