Description: When curators at the Smithsonian National Museum of American History looked at seven radiometers in storage, they learned the instruments had been at the Smithsonian for nearly one hundred fifty years.
Description: [caption id="attachment_541" align="alignleft" width="144" caption="Inscription inside Lincoln's watch, by Hugh Talman, 2009, National Museum of American History"][/caption] Does photography always report on the past? Recently, as part of the Lincoln Bicentennial celebration, the Smithsonian took a closer look at a rare Lincoln object that possessed a secret message.
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