World Hello Day Nov. 21, 2025

This harbour seal, photographed at Robert Moses State Park on Long Island in New York, United States, 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

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Nov. 21, 2023Grey seal pup
Nov. 21, 2024Aspen trees, British Columbia

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Jan. 13, 2026Hen Galan
Feb. 13, 2025Lake Tyrrell, Victoria, Australia
Jan. 9, 2026Muir Woods National Monument, California, United States
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Jun. 4, 2025Cala Luna beach, Sardinia, Italy
Dec. 12, 2024Poinsettia Day
Dec. 22, 2024Christmas tree at Crystal Pier, San Diego, California, United States
Oct. 2, 2024Autumn in the Ogilvie Mountains, Yukon
Dec. 29, 2023Oud-West neighbourhood, Amsterdam, Netherlands
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Where are these illuminated walkways?
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Sep. 27, 2024Basilica of Santa Maria della Salute, Venice, Italy
Apr. 3, 2024Pacific Rim National Park Reserve, Vancouver Island, British Columbia
Nov. 14, 2025Manatee
Locals know this place simply as ‘the Met’