DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Dentist's drill. Coloured scanning electron micrograph (SEM) of the diamond-coated tip of a dentist's drill. Diamond, a mineral form of the element carbon, is used because it is the hardest substance known and will easily wear away tooth enamel during dental procedures. Magnification: x90 when printed 10cm high.
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