1. In the United States in the 1940s, the polio epidemic was raging, and in order to curb the spread of the virus, students had to turn on the "radio class" mode. Teachers become "radio instructors" and teach on the radio.
2. This picture shows the "territorial consciousness" of the wolves vividly. This is a picture of tracking different wolves in a national park, and you can clearly see how they cleverly avoid each other's territory.
3. The hair dryer that was popular in the forties of the last century works basically the same as today, but its ingenuity lies in the unique design of wrapping the hair, so that the hair dries instantly.
4. During the First World War in 1917, French men and horses rushed to the battlefield, and the work in the fields fell on the shoulders of women. Watching them wield heavy chains to plough the land, it is really impressive: who said that women are inferior to men?
5. As early as 1936 to 1940, the American genius inventor Jesse Dixon bravely flew a flying car, fortunately, he did not encounter an accident during the test flight and lived until he was 78 years old.
6, fairy sister Liu Yifei and her mother Liu Xiaoli are in the same frame, and some netizens think that her mother Liu Xiaoli's beauty is better. No wonder, Liu Yifei once joked in an interview that she is the lowest looking person in the family!
7. In 1950, at an amateur tattoo artist contest in France, a lady generously showed off the tattoo art on her body.
8. In the 20s of the last century, a lady was in a beauty salon, concentrating on her hair. It seems that no matter how the times change, the love of beauty is an eternal melody.
9. Holding the steering wheel with one hand and the bomb with the other, this is not an acrobatic performance, but a heroic moment of a British pilot during World War I in 1916. Look at him, preoccupied with locating his target, preparing to drop a deadly bomb from a high altitude.
10. The big man who is shining on the international stage now, I think back then, he was also a sweet little baby in his mother's arms. Guess who the little guy in this photo is?
11. Amar Bharati, an ascetic from India, made an astonishing decision in 1973 in order to practice "Shiva Gong": he raised his right hand high and vowed never to put it down. Now, more than 50 years have passed.
12. The special effect of Leiden Frost is like magic, turning the steam into an indestructible protective cover, and the heat insulation effect is very good. As long as the hand speed is fast enough to fly, you can take the coal at will, insert the lead water at will, and the molten iron can be easily broken.
13. In 1988, the first "Miss Soviet Union" beauty contest kicked off, and the beauties had dreams and rehearsed intensely behind the scenes. However, who would have thought that this brilliant feast would become the perfect sound of "Miss Soviet Union".
14. In 1986, a 19-year-old African boy was accidentally nailed to a tree for stealing a radio, but as can be seen from the photo, he stood calmly and seemed to careless.
15. This station wagon, unveiled in 1885, can be called the world's first leisure travel caravan, it is made of elegant mahogany, and then painted in mysterious black and gorgeous gold, it is simply a "walking mansion".
16. Under the high-power microscope, the bacterial world on the human tongue is a spectacle and breathtaking. I can't help but think of the Buddhist saying: "One sand and one world, one leaf and one Bodhi." "The untouched microcosm of the world in front of me is like another vast universe.
17. A survey in the United States revealed an astonishing inside story: more than half of the commercial pilots actually took a nap during the flight, and what is even more bizarre is that about one-third of the pilots woke up and realized that even the co-pilot was also "dreaming of Zhou Gong".
18. This photograph, taken around 1897, shows two 19th-century jugglers, the living skeleton George Moore and the fat Fred Howe. They are the best in comedy boxing, and they make the audience laugh every time they perform.
19. In a small village in India, there is a unique ritual of praying for rain: men hold wooden sticks in their hands, lie on the cracked earth, as firm as warriors, waiting for the rain to come.
20. They are what people call "Titanic orphans", when the giant ship sank to the bottom of the sea, the two children, who were only 2 and 4 years old, were the only orphans who were lucky to be rescued without their parents or guardians.
21. In 1996, near Kolkata, India, a poor baby girl was cruelly abandoned in a trash can just after birth, but fortunately, three stray dogs became her guardian angels. Not only did they stay with her for two whole days, but they also tried to find some food to feed her.
22. In February 1954, Marilyn Monroe, a newlywed Yan'er, was invited to perform at a military base, and her charm was irresistible and her influence was far-reaching. More than 100,000 soldiers came here just to see her demeanor.
23. In 1984, somewhere in Sichuan, two girlfriends who returned from part-time jobs unexpectedly reunited, and their excitement was beyond words. They are dressed in fashionable and trendy clothes, and the BP machine at their waist is shining, as if they hold the code of the trend.
24. In the 50s of the 20th century, the social atmosphere was relatively conservative, and young women could be punished for "excessive display of clothing" if they were careless. Nowadays, the concept of freedom of dress is deeply rooted in the hearts of the people, even if you go out shirtless, no one cares about you.
25. A seemingly simple but extremely challenging puzzle that is said to be solved by only 1% of the world's people. Do you dare to take on the challenge?