A pound of feathers weighs more than a pound of gold. Precious metals like gold are weighed using troy weights, in which a pound consists of 12 ounces (5,760 grains). Objects such as feathers are weighed using avoirdupois weights, in which a pound consists of 16 ounces or 7,000 grains.
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A "light year" is a measure of distance, not time. It is defined as the distance light travels in one year. Light moves at a velocity of about 300,000 kilometres each second, so in one year, it travels about 9,500,000,000,000 kilometres.
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King Richard I the Lion-Hearted passed the first law requiring standards for length and volume. These standards were made from iron and were kept by sheriffs and magistrates.
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The number 10 is used as a convenient base to count with, but the Gauls of ancient France, the Mayas of Central America, and other peoples used a base of 20. The Sumerians, the Babylonians, and others after them used a base of 60 - convenient because 60 can be evenly divided by 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30. The use of base 60 survives in the division of hours into minutes and minutes into seconds, and the division of the circle into 360 (60 × 6) degrees.
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And finally ...
Napoleon was not particularly short. He was 5 feet 6½ inches tall, which was a typical height at the time. This height is equal to 5 feet 2 inches in old French feet (pieds du roi), which led to confusion as to his true height.
