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Ernst Mach's 1888 photograph of bowshocks from a brass bullet.  The clipped words pasted onto the photo are from Mach's "Contributions to the Analysis of the Sensations" (1910).

Ernst Mach’s 1888 photograph of bow shock waves around a supersonic brass bullet. The clipped words pasted onto the photo are from Mach’s “Contributions to the Analysis of the Sensations” (1910).