On January 24, 1848, James Marshall discovered gold on John Sutter's nearly completed sawmill in the foothills of the Sierra Nevada. By January of 1849, the Gold Rush was in full swing.Science Stock Photos - Gold
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On January 24, 1848, James Marshall discovered gold on John Sutter's nearly completed sawmill in the foothills of the Sierra Nevada. By January of 1849, the Gold Rush was in full swing.


A portrait of a physician with stethoscope.
Credit: Brian Yarvin / Photo Researchers, Inc.

Scanning electron microscopy (SEM) of dental floss after use, showing its efficiency in removing bacteria from the teeth, a process that prevents cavities. A greater part of the material removed consists of cocci and short bacilli, but very long bacilli (rods) are also visible.
Credit: Scimat / Photo Researchers, Inc.