Thanksgiving, or Thanksgiving Day, is a holiday celebrated in the United States on the fourth Thursday in November. It became an official Federal holiday in 1863, when, during the Civil War, President Abraham Lincoln proclaimed a national day of “Thanksgiving and Praise to our beneficent Father who dwelleth in the Heavens”, to be celebrated on […]

The word game “Doublet” was invented by Lewis Carroll (1832-1898), the author of children’s classics “Alice in Wonderland”, Lewis Carroll was also a mathematician, who was known to his fellow mathematicians as Charles L. Dodgson. Aside from children’s classics, he had also written a number mathematics books.