This harbour 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.

Seals, it turns out, raise their flippers primarily for thermoregulation. But to us, it looks like they're saying 'hello,' making them the perfect mascots for the day. So, as you look at this waving seal, take its cue: say hello to someone new today—a neighbour, a coworker or even a passerby. One word might just make a ripple of peace across your own little sea.