Cold knowledge refers to trivial and complicated things or knowledge, which is full of interest and always surrounds our lives, but few people pay attention to it. This kind of knowledge seems strange, but it can increase people's knowledge, broaden their horizons, enlighten their thinking and arouse a strong thirst for knowledge.

1. Of all the creatures on the earth, only human beings have chins.

2. When sneezing, you can't block your nose and mouth at the same time. If you push too hard, your throat may be broken.

3. The elephant's skin is very thick, the thickest may reach 2.45 cm, and it is very sensitive, and it can feel insects falling on it.

At the beginning of western wedding, the bride and bridesmaid wear the same clothes, mainly to avoid evil spirits invading the couple's body and affecting their happiness.

Counting the steps of the U.S. Capitol in Washington, there are 365 floors, which means that people who walk the steps are always at the forefront of the times and in the most advanced leadership position.

6. The red tassel on the red tassel gun is not used for decoration. Its original purpose was to prevent the blood from flowing to the hand during the battle, causing the pike to slip from the palm.

7. Put the cooked bread into the refrigerator, and then take it out for reprocessing. The heat will be reduced by half.

8. Tears will change with different moods. Tears shed when you are happy are completely different from tears shed when you are sad. Similarly, the composition of physiological saline left involuntarily when cutting onions is also different.