The "terahertz wave", also known as the life ray, is an electromagnetic wave emitted by all substances and life in the natural world.

All substances in nature, such as animals, plants and minerals, are composed of atoms and molecules.

These molecules and atoms vibrate by absorbing the energy of nature and the universe. This vibration produces a terahertz wave.

The energy of terahertz waves emitted by all matter in nature is weak, but it is called a life ray because it determines the properties of all matter and controls all life activities in the universe.

Terahertz waves are electromagnetic waves that have the properties of both light and radio waves. The frequency of terahertz waves is between 1 trillion Hz and 100 trillion Hz.

Its wavelength is between 3 μm and 1 mm (1,000 μm). Terahertz waves have the properties of both light and radio waves, so they have straightness, transparency, and permeability.