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

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

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Jan. 27, 2026Dalmatian pelicans, Lake Kerkini, Greece
Nov. 2, 2023Death Valley National Park, California
Jul. 27, 2025Barracudas at Shark Reef, Ras Mohammed National Park, Sinai Peninsula, Egypt
Aug. 30, 2023International Whale Shark Day
Tis the season for travel
Feb. 4, 2024Devetashka Cave, Devetaki, Bulgaria
Feb. 27, 2026International Polar Bear Day
Feb. 22, 2025Gateway Arch in St. Louis, Missouri, United States
Three petals and three leaves
Jan. 28, 2025Short-eared owl
Jul. 18, 2025Orosei, Sardinia, Italy
Jan. 28, 2026Whanganui National Park, Retaruke, New Zealand
Jun. 10, 2024The city of Osaka at night, Japan
‘Night shining’ clouds
Nov. 13, 2023Serra de Tramuntana, Balearic Islands, Majorca, Spain
Mar. 18, 2025Red Rocks, Sedona, Arizona, United States
Jun. 17, 2024Pollinator Week
Beauty by the bay
Where did you drop the fish, son?
Reflecting its stylish past today
Jun. 21, 2025World Giraffe Day
Mar. 5, 2025Khao Sok National Park in Thailand
Chilling out on an ice floe
Bridging the gap two ways
Southern tip of a northern isle
Big rocks, big heads, still counting?
Aug. 10, 2024Joshua Tree National Park, California, USA
Aug. 7, 2025Monoliths of the Mingan Archipelago, Quebec
Sep. 27, 2024Basilica of Santa Maria della Salute, Venice, Italy
Oct. 6, 2023Taughannock Falls State Park, New York