The usual form of footbath, which is commonly done in resorts or spas, is different from the detox foot spa machines sold in the market today. Footbath have originated from a Japanese legend occurred about 1,600 years ago. It was narrated by a group of sickly people and monks who made pilgrimage.
Sun is generating energy by nuclear fusion. And nuclear fusion will emit energy in the form of gamma rays. Normally earth's ozone filtering the Ultraviolet radiation. And magnetic fields of earth deflecting the cosmic rays(charged particles).
The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth, although the thickness varies seasonally and geographically. The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson.