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On October 24, 1945, at the San Francisco Conference, following unanimous agreement by representatives from over 40 nations that signed the "United Nations Declaration," led by China, the Soviet Union, the United Kingdom, and the United States (in alphabetical order of country names), the "United Nations Charter" officially took effect, and the United Nations was established. Its purpose is to maintain international peace and security and to promote international cooperation. [Playio] On This Day: October 23rd https://link.playio.co/w3vtsso

On October 23, 1868, Emperor Mutsuhito, the 122nd Emperor of Japan, officially changed the era name to 'Meiji' and established Japan's one-emperor-one-era system. [Playio] On This Day: October 22nd https://link.playio.co/1lnjjl2

On October 22, 1883, the Metropolitan Opera House (The Met) in New York City officially opened. The inaugural performance was the opera 'Faust' by French composer Charles-François Gounod, sung entirely in Italian. The theater is the largest opera venue in the United States, staging approximately 240 operas annually. [Playio] On This Day: October 21 https://link.playio.co/i9d75rq

• No Incisors: Cows have thick lips and lack incisors and canines in their upper jaw, possessing only a thick, hard palate. They use their lower incisors and this palate to bite off grass. • Square Pupils: A cow's pupils are rectangular, not round, granting them an extremely wide horizontal field of vision, useful for constantly watching out for predators.

On October 21, 1600, the Eastern Army led by Tokugawa Ieyasu defeated the Western Army composed of Ishida Mitsunari and others in the Battle of Sekigahara, laying the foundation for Ieyasu to establish the Tokugawa Shogunate three years later. [Playio] On This Day: October 20th https://link.playio.co/usjj6d9

• Cooling with Ears: Elephants don't sweat. They use the blood vessels in their large ears to cool down, then circulate that cooler blood throughout their body. • Can Get Sunburned: Because their skin can get sunburned, elephants throw sand on their backs and heads to protect themselves from the sun. • Longest Gestation Period: Elephants have the longest gestation period of all land mammals, averaging 21 to 22 months (nearly 2 years).

On October 20, 1973, the Sydney Opera House officially opened. The building was designed by Danish architect Jørn Utzon and later completed by Peter Hall, leading an Australian architectural team. The opening ceremony was inaugurated by Queen Elizabeth II of the United Kingdom. The Sydney Opera House is one of Australia's most iconic landmarks and one of the most distinctive buildings of the 20th century. In 2007, it was designated a UNESCO World Heritage site. [Playio] On This Day: October 19th https://link.playio.co/19k1qzu

Horses and mice cannot vomit: Due to their stomach structure and muscle coordination, horses are physically unable to vomit.

Have you ever noticed your tire pressure warning light suddenly come on when the weather gets cold, even though there are no leaks? This is actually related to the 'Gas Pressure-Temperature Relationship' in physics. When the ambient temperature drops, the air molecules inside the tire move slower. With little change in the tire's volume, the tire pressure naturally decreases. Generally, for every 10°C drop in temperature, tire pressure can decrease by 1-2 PSI. The actual amount depends on the initial tire pressure and temperature. However, when you drive, the tires heat up due to friction and repeated deformation, causing the tire pressure to rise again naturally. Therefore, it's best to check your tire pressure when the vehicle has been parked for several hours and the tires are still cold. Also, the maximum tire pressure indicated on the sidewall is not the recommended daily value. For the correct inflation standard, you should refer to the original tire pressure label found on the door frame. 💡 Today's Fun Fact: Tire pressure changes with temperature. Regularly checking your cold tire pressure ensures driving safety, tire longevity, and fuel efficiency!

On October 19, 1745, Irish writer Jonathan Swift passed away. He became world-famous for his 1726 publication, "Gulliver's Travels," and his works have been adapted into anime, movies, and TV series. Hayao Miyazaki's animated film "Castle in the Sky" was also adapted from his novella, "A Voyage to the Islands." [Playio] On This Day in History: October 18th https://link.playio.co/mbmeclj