1. One gram of king cobra venom can kill 150 people.

2. The expiration date on mineral water is actually the expiration date of the mineral water bottle.

3. Lips are actually very delicate. Frequently biting your lips with your teeth will make the lip lines deeper and deeper, and in severe cases, it may even cause cheilitis.

4. The longest recorded lightning strike lasted 16.73 seconds.

5. Duck necks do have lymph nodes, but these lymph nodes are located under the skin, and most duck necks on the market are skinless.

6. Sometimes lions can mate more than 50 times a day.

7. The child that Sima Guang saved by smashing the water vat was named Shangguan Shangguang. Shangguan Shangguang's original name was Shangguan Shang. In order to thank Sima Guang for saving his life, he added the character "Guang" to the end of his name.

8. Potatoes have a starch content as high as 17%, which is not much lower than that of rice, which has a starch content of 26%. Although potatoes are a vegetable, they can also be used as a staple food.

9. Zebras are afraid and cannot fall asleep alone.

10. The phrase "下马威" originally referred to the imposing manner that an official displayed to his local subordinates upon assuming office in ancient times.

11. In medieval Europe, before going to war, people would greet each other and say, "Gentleman, please fire first."

12. Indians have great respect for cows, which hold a very high status in India. Interestingly, India is also the world's largest exporter of beef. The reason is that India considers only its native zebu cattle to be sacred, while water buffalo are considered to be born to be slaughtered.

13. Adults blink an average of 15 times per minute, while infants blink an average of 2 times per minute.

14. Rabbits eat 80% of their droppings themselves or their companions.

15. Two thousand hairs can withstand a force of 30 kilograms.

16. The Eiffel Tower was controversial when it was first built. For example, the famous French novelist Guy de Maupassant condemned it as a useless and bizarre building. However, Guy de Maupassant loved to eat in the restaurant in the tower because it was the only place where he could not see the Eiffel Tower.

17. The U.S. Capitol in Washington, D.C. has 365 steps, symbolizing the 365 days of the year.

18. The surface temperature of the eyeball remains above 10 degrees Celsius and does not feel cold.

19. The white plastic chairs with backrests commonly seen at street food stalls are the most common chairs in the world.

20. If fingernails need to be trimmed once a week, then toenails only need to be trimmed once a month, because toenails grow almost four times slower than fingernails.