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

palette

Today in History

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

More Desktop Wallpapers:

May 23, 2025World Turtle Day
Pearl among the emeralds
Aug. 13, 2024Telašćica Nature Park, Dugi Otok, Croatia
Sep. 3, 2025Grizzly bears at Katmai National Park and Preserve, Alaska, United States
Dec. 4, 2024Wildlife Conservation Day
Celebrating art in the city
Jun. 14, 2024Peggys Point Lighthouse
Get ready for the blood moon
Apr. 26, 2025Bruce Peninsula National Park, Ontario
Hot enough to howl
Sep. 16, 2024Wallabies at sunrise, Australia
Dec. 25, 2023Christmas Day
May 28, 2025World Otter Day
Oct. 18, 2025International Archaeology Day
The largest gypsum dune field
Feb. 3, 2025Ribblehead Viaduct, North Yorkshire, England
Jul. 22, 2025Badlands National Park, South Dakota, United States
Sep. 8, 2023International Literacy Day
Blue hues and ceramic scenes of Porto
Apr. 17, 2024Black bear cub emerges into spring
Mar. 30, 2025Sydney Harbour, New South Wales, Australia
We’ve identified these ‘flying objects’
Aug. 21, 2024Nazca boobies, Wolf Island, Galápagos Islands, Ecuador
Sep. 22, 2023World Rhinoceros Day
Dec. 1, 2024Antarctica Day
Who’s snoozing?
Jan. 13, 2026Hen Galan
Jan. 18, 2026White Sands National Park, New Mexico, United States
Dec. 25, 2024Merry Christmas!
Grizzly bear and cub