I was still very young back then and had no experience, but my father taught me about it.
In China in the 1970s, most people received very little education.
Many people had the strange idea, but it was essentially a variation of the perpetual motion machine, and most of them were what you might call the first kind of perpetual motion machine.
Many people became obsessed with these ideas, and some lost all their possessions.
At the time, this enthusiasm for perpetual motion machine research spread throughout the country, and in 1977, the People's Daily published three consecutive articles openly condemning perpetual motion machines, even going so far as to criticize the act of organizing specialists to develop them as "the most foolish plan in the world."
In May 1978, we published another article titled "Dispelling the Illusion of Perpetual Motion Machines."
Anyone with even a basic understanding of Chinese politics should know what it means when the People's Daily intervenes.
At that time, a method called "ultrasonic heating," which heated water without using coal, was popular.
Essentially, it was nothing more than a water pipe with a thin sheet of iron welded to one end, placed underwater.
It was said that when cold water flowed through the pipe, the metal plate vibrated, generating what is known as "ultrasonic waves," which then heated the water in the bathtub.
I have never seen the actual device myself. The image was generated by AI.
Theoretically, cold water has potential energy due to gravity, so it is possible that a small amount of heat could be generated.
However, in reality, it had no effect whatsoever.
According to my father, this device was installed in public bathhouses back then, but its only effect was that occasionally someone would suddenly jump out of the bath clutching their bleeding bottom...
I felt it was necessary to record that absurd period in our country's history because I realized that many of our compatriots no longer know about it.