Ball Lightning is trying to tell people over many centuries not only that their knowledge is limited but also to prompt them that there is a perfectly new world governed by the same physical laws where light bubbles are responsible for many phenomena which are called at present abnormal. Ball Lightning is a combination of intense light and a film of air compressed by the light. The compressed air provides circulation of the light in the film. The circulating light, in its turn, provides air compression. It can be said that Ball Lightning is a self-confined light, circulating in a thin spherical layer of compressed air, which is produced by the same light. In other words, the light circulates in a spherical trap, which was set up by the same light. Such puzzles of behaviour of Ball Lightning as penetration through windowpanes, movement in a direction which does not coincide with the direction of the wind, accompanying of airplanes and penetration in their salons, radiation of 'cold' white light can be explained only on the basis of the considered concept. The presented theory of light bubbles disproves arguments of opponents that the existence of light bubbles contradicts laws of physics. Methods and the means used in non-linear optics and theory of optical resonators on the basis of waves of type whispering gallery are applied for the description of the phenomena inside a nucleus and internuclear interactions. Consideration of a nucleus as an analogue of a Ball Lightning with finite life time enabled to propose a new approach to an explanation of the phenomenon of natural radioactive decay. Knowledge of physical conditions in Ball Lightnings and the assumption that these conditions are favourable for acceleration of radioactive decay give a lot of information about processes responsible for such decay. Acceleration of radioactive decay opens a way to development of new alternative sources of energy.