1. Japan has no deserts, but it has built a desert museum on the island of Honshu, which houses samples of almost all the world's deserts.

2. During the Qing Dynasty, the fastest postal stations were 600 li, 400 li, and 200 li. The use of postal services was strictly regulated, and even governors-general and generals who abused them were punished. The 600-li postal service could only be used when the four highest-ranking officials in a province—the governor-general, general, admiral, and education commissioner—died in office or were in mourning, or when a city was lost or recaptured.

3. Salt had a very important value in ancient times. The famous Oxford English Dictionary devoted nearly four pages to explaining the word "salt," which far exceeded the explanations of other foods.

4. Before eyeglasses appeared in Europe, Europeans with poor eyesight tried all sorts of strange methods to improve their vision, such as hanging a cow's eye around their neck or using a red cloth bag containing a fox's dried tongue and then tying it around their neck to improve their vision.

5. The great Tang Dynasty poet Bai Juyi had a fanatical fan named Ge Qing, who tattooed thirty of Bai Juyi's poems on his body from the neck down, complete with illustrations. His body was covered in tattoos, which became known as the "Bai Juyi's Walking Poems" by his contemporaries.

6. my country's martial arts examination originated during the reign of Empress Wu Zetian in the Tang Dynasty and was not abolished until the invasion of China by the Eight-Nation Alliance in 1901, having lasted for over 1200 years. The Qing Dynasty's martial arts champion examination was quite difficult, requiring candidates to wield a broadsword weighing over 80 jin (approximately 40 kg) and lift a large stone weighing 200 to 300 jin (approximately 100 to 150 kg) with both hands.

7. In ancient times, the term "Doctor" mostly referred to an official title, indicating someone in charge of education and sometimes etiquette. During the Yuan Dynasty, in some parts of Jiangnan, tea sellers and doctors were called "Doctors." The adoption of "Doctor" as an academic degree system was introduced from the West.

8. Japan has a population of only 120 million, but 150,000 surnames. Most Japanese surnames are written in kanji, usually two characters long, with a few having three or even one character. Among them, Sato, Suzuki, Tanaka, Yamamoto, Kobayashi, Watanabe, Saito, Nakamura, Ito, and Takahashi are the top ten most common surnames.

9. Historically, both Philadelphia and New York have served as the capital of the United States. After the death of the President of the United States in 1799, Congress decided to name the capital after him, selecting a location at the border of Maryland and Virginia. Washington, D.C., had only 3,000 residents when it was first established as the capital, but it has now become a truly cosmopolitan metropolis.

10. In medieval Europe, pigs held a high status, roaming freely in the streets without any restraint. They frequently broke into homes and even killed unattended infants. Even when a pig committed a heinous crime, people dared not kill it themselves. Instead, they had to bring it to court, file a lawsuit, and have a judge sentence it to death.