About scientific knowledge:
1. Blow the hair dryer on the label until the glue of the trademark is hot, and then the label can be easily peeled off;
2. If you are afraid of wrinkles when bringing clothes when traveling, you can roll each piece of clothes into a roll;
3. Drink some vinegar when you burp, it will help;
4. If you eat something with a peculiar smell, such as garlic or rotten rot, you can just eat a flower;
5. Treat coughs, especially coughs. Before going to bed at night, fry eggs with pure sesame oil. Add a little more oil. Do not add any seasonings. Eat it while it is hot and then go to bed. The effect will be obvious after eating it for several days;
Four Great Inventions : Gunpowder, papermaking, compass and printing! !
1. Porcelain. 7,800 years ago, the ancestors of the Wei River and Jing River basins in the northwest were already able to bake red and gray ceramics in various shapes.
2. Solar energy utilization. More than 3,000 years ago, my country had the development and utilization technology of solar energy.
3. Casting. In ancient times, my country has used three major casting methods and technologies: mud casting, iron casting, and wax casting.
4. The discovery of oxygen. Oxygen has been discovered in ancient Chinese alchemy.
5. Physics Laboratory. In ancient my country, there was a vibroacoustic laboratory, which was the earliest physics laboratory in the world.
6. Light source. As early as 250 AD, our country was able to manufacture copper lamps that could change and adjust the brightness.
7. Thermometer. The balance thermometer invented in the Western Han Dynasty was more than 1,600 years earlier than the one in Europe.
8. Gyroscope. As early as the Eastern Han Dynasty, gyroscopes were used for navigation, more than 1,300 years earlier than those in Europe.
9. Clocks. It was invented by Zhang Heng of the Eastern Han Dynasty and is the earliest in the world.
10. Drilling technology. In the 11th century, the Northern Song Dynasty created the deep hole drilling technology of more than 200 meters.