World Hello Day Nov 21, 2025

World Hello Day

This harbor seal, photographed at Robert Moses State Park on Long Island, New York, seems to be onto something—spreading good vibes, one wave at a time. That"s exactly the spirit of World Hello Day, celebrated every November 21. This cheerful observance began in 1973 when two American brothers, Brian and Michael McCormack, launched it as a peaceful response to global tensions. They mailed 1,360 letters in seven languages to world leaders, inviting them to join the first celebration. Their message was simple yet powerful: personal communication can help preserve peace. Today, people in more than 180 countries participate.

© Vicki Jauron, Babylon and Beyond Photography/Getty Images

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Today in History

Nov 21, 2018A showcase for future fame
Nov 21, 2019Le Beaujolais nouveau est arrivé!
Nov 21, 2020Headed to the High Country
Nov 21, 2021The Great Glen
Nov 21, 20222022 FIFA World Cup
Nov 21, 2023Gray seal pup, Norfolk, England
Nov 21, 2024Lion cubs, South Africa

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Jan 24, 2018Santo Antão Island in the Republic of Cabo Verde
Oct 25, 2023Grand Staircase-Escalante National Monument, Utah
May 30, 2020Meandering through Patagonia
Aug 2, 2024Virgin Islands National Park established
Jul 13, 2019Batten down the hatches
May 3, 2021It s Teacher Appreciation Week
Dec 15, 2022Borovets ski resort in Bulgaria
Apr 14, 2022Horseshoe Bend, Arizona
Dec 23, 2019A Festivus for the rest of us
Nov 1, 2023Native American Heritage Month
Dec 3, 2021Frost on autumn leaves
May 11, 2021 The Crown of the Continent
Jun 17, 2025Maritime forest in Cumberland Island National Seashore, Georgia
Dec 4, 2019Protecting endangered giants
Oct 19, 2021These laurels are hardy
Jun 18, 2018Here, fishy!
Feb 23, 2020An icy extravaganza
Jun 27, 2020Looking for peace on the precipice
Aug 25, 2025Yellowstone for the National Park Services birthday
May 21, 2018Is that a face in the sand?
Nov 24, 2023Hoh Rain Forest, Olympic National Park, Washington
Mar 30, 2019Here’s why landmarks are going dark
Jul 10, 2025Independence Day of the Bahamas
Aug 23, 2019Harvest time in the Palouse
Jun 21, 2020Grab onto the handlebars, kid
May 10, 2020Happy Mother s Day
Jul 25, 2021Illuminated Uluru
Nov 26, 2025World Olive Tree Day
Apr 25, 2021One giant leap for penguins