Celebrated annually on October 23 from 6:02 a.m. to 6:02 p.m., Mole Day commemorates "Avogadro's Number": 6.02 x 10 23. This number--called a mole--is a basic measuring unit in chemistry. Mole Day ...

World Post Day is celebrated each year on 9 October, the anniversary of the establishment of the Universal Postal Union in 1874 in the Swiss Capital, Bern. It was declared World Post Day by the ...

United Nations Day, on 24 October, marks the anniversary of the ... has rarely been greater. UN Day, celebrated every year, offers the opportunity to amplify our common agenda and reaffirm the ...