- Rare photo of Lincoln at Gettysburg (archives.gov)
In 1952, the chief of the Still Photo section at the National Archives, Josephine Cobb, discovered a glass plate negative taken by Mathew Brady of the speaker’s stand at Gettysburg on the day of its dedication as a National Cemetery. Edward Everett would speak from that stand later in the afternoon for two straight hours. Moments later, a tall, gaunt Abraham Lincoln would stand up and deliver a ten sentence speech in two minutes. It was the Gettysburg Address.
- Bohr model (Wikipedia)
In atomic physics, the Bohr model or Rutherford–Bohr model is an obsolete model of the atom, presented by Niels Bohr and Ernest Rutherford in 1913. It consists of a small, dense nucleus surrounded by orbiting electrons. It is analogous to the structure of the Solar System, but with attraction provided by electrostatic force rather than gravity, and with the electron energies quantized (assuming only discrete values).