Mary Roach quoteMary Roach [1959-0]
American Author 
Quote rank: 215
| Chew on this: Human teeth can detect a grain of sand or grit 10 microns in diameter. A micron is 1/25,000 of an inch. If you shrank a Coke can until it was the diameter of a human hair, the letter O in the product name would be about 10 microns across. |
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