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Christian Conrad Sprengel - Nature
Nature· 3 days agoSPEAKING of Christian Conrad Sprengel's discoveries, Dr. H. A. Hagen says (NATURE, vol. xxix. From the complete want of papers relating to the facts observed, and the theories proposed by Sprengel ...
How to Properly Use Your Electric Toothbrush for the Best Clean
CNET· 2 days agoTo keep your teeth as healthy as possible, the American Dental Association recommends brushing twice...
