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A recording from the heart sound laboratory at The Johns Hopkins Hospital, recorded in 1955. Video is a real-time spectrograph of the heart sound, EKG and respiration recordings from playback of the digitized audio file in Izotope RX.

This poster depicts soldiers firing machine guns with a stream of War Savings Stamps forming a gun cartridge. Americans were encouraged to buy the stamps to help fund the US involvement in the war, and posters like this one both raised awareness of…