World Speech Day
World Speech Day is held on March 15. The idea came from Simon's work in establishing a free database for contemporary and historic speeches. Speeches change the world: socially, politically, in the arts, business and religion. World Speech Day was launched by Simon Gibson at the Athens Democracy Forum in 2015. This event in the second decade of the month March is annual. 
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Human speech predates written language by tens of thousands of years. No one knows exactly how old spoken language is. Though it's a common belief that women talk more than men, the evidence is inconclusive.
Talking requires the use of dozens of muscles in the lips, throat, and tongue, but speaking in a normal tone is no more tiring than sitting in silence. French philosopher Jean-Jacques Rousseau argued that speech arose not out of need but as a way to express our passions. Twentieth-century ethnographers developed "Conversation Analysis" as a way to learn about various cultures through recording and analyzing everyday speech.
Similar holidays and events, festivals and interesting facts
International Napping Day on March 14
International Ask a Question Day on March 14 (Today, on the 14th March, was Albert Einstein’s birthday in 1879);
International Mathematics Day on March 14
World Day of Muslim Culture, Peace, Dialogue and Film on March 15
International Day Against Police Brutality on March 15
International Day to Combat Islamophobia on March 15
World Consumer Rights Day on March 15
International Adolescent Health Week on March 16 (Being a part of International Adolescent Health Week is easy! Wear lime green or share lime green giveaways and prizes all week long);
World Sleep Day on March 16 (is an annual event, intended to be a celebration of sleep and a call to action on important issues related to sleep, including medicine, education, social aspects and driving. It is organized by the World Sleep Day Committee of World Sleep Society [founded by WASM and WSF] and aims to lessen the burden of sleep problems on society through better prevention and management of sleep disorders. World Sleep Day is held the Friday before Spring Vernal Equinox of each year)