World No Tobacco Day

World No Tobacco Day (WNTD) is observed around the world every year on May 31. It is meant to encourage a 24-hour period of abstinence from all forms of tobacco consumption across the world. The member states of the World Health Organization (WHO) created World No Tobacco Day in 1987.

Charles Greeley Abbot

Charles Greeley Abbot was born on May 31, 1872 an he was  an American astrophysicist. As an astrophysicist, he researched the solar constant, research that led him to invent the solar equipments and other patented solar energy inventions. He died on December 17, 1973.