How much does a 1 carat diamond weigh?
A 1 carat diamond weighs 200 milligrams, or 3.086 grains troy.
The measurement originally represented the weight of a seed of the carob tree.
The first woman in space was Valentina V. Tereshkova of the USSR. She made 48 orbits of the earth in a three-day mission in Vostok 6, June 16 to 19, 1963.
The first blood bank was not opened until 1940 in New York City. It was designed and operated by American surgeon Richard Charles Drew (1904-1950). He could not contribute blood to the bank because he was black.
The first personal ad might well have been a matrimonial advertisement that appeared in a British publication called the Collection for the Improvement of Husbandry and Trade on July 19, 1695. The ad read: A Gentleman about 30 Years of Age, that says he has a Very Good Estate, would willingly Match Himself to some…
The Lincoln Highway was the first coast-to-coast paved road in the United States. Opened in 1913, it ran from New York to California.
To assess voters’ preferences in the 1824 presidential election, citizens were asked whom they preferred. This was the first public opinion poll. The results, published in the Harrisburg Pennsylvanian on July 24, 1824, gave Andrew Jackson a commanding lead over John Quincy Adams and all others. However, Adams won the election.
Hiram Revels (1822-1901) of Mississippi became the first black senator on February 25, 1870. He completed the term begun by Jefferson Davis, who had resigned to become the president of the Confederacy. Aside from Blanche K. Bruce, who represented Mississippi from 1875 to 1881, there were no other black senators until 1966, when Edward Brooke,…