November 1 is World Vegan Day, a celebration of people who don't eat meat. Or eggs. Or cheese. Or mayonnaise. Or honey. Or whey. Or gelatin. Or anything that comes from or includes an animal. Nor do they use any clothing, accessory or object made from an animal. No leather, no wool, no pearls, no ivory-keyed pianos. The animal-free holiday began in 1994, to commemorate the 50th anniversary of the Vegan Society.
Veganism is an extreme form of vegetarianism, and though the term was coined in 1944, the concept of flesh-avoidance can be traced back to ancient Indian and eastern Mediterranean societies. Vegetarianism is first mentioned by the Greek philosopher and mathematician Pythagoras of Samos around 500 BCE. In addition to his theorem about right triangles, Pythagoras promoted benevolence among all species, including humans. Followers of Buddhism, Hinduism, and Jainism also advocated vegetarianism, believing that humans should not inflict pain on other animals.