World Hello Day Nov. 21, 2025

World Hello Day

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

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

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Dec. 15, 2023SantaPark, Lapland, Finland
Apr. 28, 2024El Capitan in the Guadalupe Mountains National Park, Texas, USA
Sep. 18, 2025Dunquin Pier, County Kerry, Ireland
Aug. 21, 2025Wheatear, Peak District National Park, England
Platinum Jubilee celebrations
Apr. 10, 2026Siblings Day
Red rock country
Nov. 21, 2024Aspen trees, British Columbia
Nov. 4, 2025Tower Bridge, London, England
Jan. 6, 2024Vermilion Lakes, Banff
Jul. 2, 2025Spine-cheeked anemonefish
Nov. 21, 2023Grey seal pup
Nov. 9, 2025Carl Sagan Day
A public restroom or a tourist spot?
Blurring the lines with wearable art
A shiver of sharks on the hunt
Dec. 7, 2025A pine forest in Alsace, France
May 24, 2025European Day of Parks
Jun. 29, 2025International Day of the Tropics
King of the ocean
Dec. 20, 2025Christmas star lanterns, Germany
Aug. 8, 2024Spotted owlet, Bangkok, Thailand
Oct. 25, 2025Martimoaapa Mire Reserve, Finland
Why are blackbirds tied to winter?
Nov. 3, 2024International Day for Biosphere Reserves
Three petals and three leaves
Jan. 23, 2024Maldives
Jan. 29, 2026Milwaukee City Hall, Wisconsin, United States
Mar. 2, 2024Modica, Sicily, Italy
‘Only one Earth’