① All polar bears are left-handed

All wild polar bears are left-handed, using their left paw to break the ice and catch seals when hunting.

②Cola was originally a green potion.

Coca-Cola, invented in 1886, was originally a green herbal juice used to treat headaches; it was only in 1920 that it was turned brown.

③ The prototype of the King of Hearts in playing cards is the father of Europe.

The King of Hearts is Charlemagne, whose empire split into the early stages of the Franco-German-Italian kingdoms.

④ The blood of Antarctic icefish is transparent.

Antarctic icefish are the only known vertebrates without hemoglobin. They rely on a low-temperature, high-oxygen environment and an enormous heart to maintain their metabolism, and their blood is transparent.

⑤ "Husband" was once a eunuch's title.

During the Ming and Qing dynasties, eunuchs were called "husbands," while the modern term for husband and wife originated from the New Culture Movement in the Republic of China.

⑥ Venus gets longer each day than a year

Venus has a rotation period of 243 Earth days and an orbital period of only 224.7 Earth days. Although the nights are also extremely long, Venus's atmosphere contains 96% carbon dioxide and is thousands of meters thick, creating a "one-way heat transfer" mechanism that results in extremely high temperatures even at night.

⑦ A newborn's first stool is green.

The fetal intestines contain meconium, which contains bile and amniotic fluid residue, and is medically known as "meconium green".

⑧ Watermelons were only introduced to China during the Song Dynasty.

Watermelons, originally from Africa, were introduced to China via the Western Regions, and a watermelon stall first appeared in the Southern Song Dynasty painting "Along the River During the Qingming Festival".

9. Keyboards have more bacteria than toilets.

A keyboard contains 3,300 bacteria per square centimeter, while a toilet seat contains only 1,600.

⑩ The salt tree can produce salt and vinegar.

A tree species unique to China, its bark precipitates salt crystals, its fruit can be soaked in water to make vinegar, and its roots and leaves can be used in medicine.