Thermal radiation and energy

All objects emit heat in the from of waves. From investigation into this phenomenon, humans discovered the existence of the "quantum" at the end of the 19th century. This gave birth to quantum theory, which not only changed the way we look at the origins of nature, but also became a foundation for producing our current advanced technology. On the other hand, the concept of "energy" was introduced from studying the true nature of heat. Energy takes such forms as heat, motion, electricity, and light.