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Newsboys cleaning their faces in a lodging house washroom.

3 boys sleeping on a metal grate in an alleyway

Photograph of a photo

Photo of tenement buildings in Brooklyn

The invention of the airplane

An anti-suffragist pamphlet explaining why women should not have the right to vote

Alexander Graham Bell demonstrated several experimental telephones at the Philadelphia Centennial Exposition in 1876. This unit features a single electro-magnet and could be used both as transmitter and receiver. Bell approached the problem of…