Work on beam weapons also continued in the United States. In 1958 the Defense Advanced Research Projects Agency (DARPA) initiated a top-secret project code-named "Seesaw" at Lawrence Livermore Laboratory to develop a charged-particle beam weapon. More than ten years and twenty-seven million dollars later, the project was abandoned "because of the projected high costs associated with implementation as well as the formidable technical problems associated with propagating a beam through very long ranges in the atmosphere." Scientists associated with the project had no knowledge of Tesla's papers.
Tesla displayed his phosphorescent lighting, powered without wires by high-frequency fields, and employed a similar process, using high-voltage, high-frequency alternating current to shoot lightning from his fingertips. Tesla displayed the first practical phosphorescent lamps (a precursor to fluorescent lamps). Tesla’s lighting inventions exposed to high-frequency currents would bring the gases to incandescence. Tesla also displayed the first neon lights. His innovations in this type of light emission were not regularly patented.
Magnetic Resonance Imaging (MRI) is extremely important for medical diagnosis of internal organs of the human body, especially the diagnosis of cancer, tumors, degenerative diseases of the brain and spinal cord. The modern diagnosis of the internal organs of the human body would be today unthinkable without MRI. MRI machines are widespread with many variations in size and capacity all around the world. The revenue of MRI machines sales was billion dollars in 2002. Revenue for MRI machine sales is expected to increase in the following years.