If your senses are working normally, you can:

• Feel on your fingertips or face a pressure that depresses your skin a bare .00004 inch.
• See a small candle flame from 30 miles away on a clear, dark night.
• Smell one drop of perfume diffused through a three-room apartment.
• Taste .04 ounce of table salt dissolved in 530 quarts of water.
• Feel the weight of a bee’s wing falling on your cheek from less than half an inch away.
• Distinguish among more than 300,000 different color variations.
• Gauge the direction of a sound’s origin based on a .00003-second difference in its arrival from one ear to the other.

John D. McGervey and Bill Sones in Buffalo (N.Y.) News Magazine, quoted in Readers Digest, May 1996, p. 91.