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Gaylord Nelson founded Earth Day. It was renamed officially by the U.N. in 2009 as International Mother Earth Day, and some schools and communities celebrate the day for an entire week. Also, the first Earth Day was celebrated on April 22, 1970.


D-Day occurred on June 6, 1944 when the Allies invaded Normandy, successfully turning the tide of World War II. Over 156,000 allied troops landed on 50 miles of beach in the largest seaborne invasion in history, liberating Northern France over the course of the next three months.


Earth Day began in the late 1960s following the Vietnam War and was originally created with political aims. The Earth Day holiday on April 22 actually follows the first Earth Day of the year on March 20, the spring equinox.


The first of December of each year marks World AIDS Day to encourage people worldwide to show support for those who are living with human immunodeficiency virus, or HIV, and acquired immunodeficiency syndrome, or AIDS. It is a day of remembrance for those who have died from the disease, according to


Mole Day is a day that is celebrated in commemoration of Avogadro's Number, which is a unit of measurement in chemistry applications. This number, which is 6.02 x 10 to the 23rd power, is celebrated annually between 6:02 a.m. and 6:02 p.m. on Oct. 23.


In the Roman Catholic Church, All Saints Day, observed on November 1 each year, is a solemn liturgical day that commemorates all of the saints in heaven, including those officially canonized by the church, unknown saints and those not yet canonized. The history of All Saints Day lies with Pope Bonif


HistoryOrb.com offers historical facts about any specific date in history. To find out information about a specific date, such as one's birth date, use the Date Search feature on the right side of the homepage.


Valentine’s Day, celebrated on February 14 every year around the world, is actually based on a true story. The Catholic Church recognizes several different saints named Valentinus. The saint celebrated on Valentine’s Day is officially known as St. Valentine to differentiate him from other “Valentine


Saint Patrick's Day is a national holiday in Ireland and is celebrated around the world with parades and celebrations. Saint Patrick is famous for bringing Christianity to Ireland and allegedly driving away snakes. Scholars suspect these are metaphorical snakes, as the climate in Ireland is too cold


Towards the end of his life, Martin Luther King Jr. expanded his Civil Right Movement to Los Angeles, Chicago and other major American cities, according to Biography.com. At this time, young, militant black-power leaders publicly challenged and criticized Martin Luther King Jr., saying that his meth