The Casimir effect makes zero energy an indisputable and universally accepted phenomenon in the scientific community. However, the word "zero energy" has been involved in some controversial fields: the design and invention of the so-called "free energy" device is similar in concept to the perpetual motion machine in the past, and the success of development is also similar. In foreign countries, many amateurs have devoted themselves to research, claiming that they have achieved certain results, and there are even online forums dedicated to discussing free energy. These people invented a word to describe this device, which means that the output energy of a device is greater than the input energy. There are also many companies that claim to have successfully developed this kind of equipment. But it seems that the scientific community does not accept such inventions and discoveries, and such companies are also criticized as fraud groups.
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