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" Bernard Shaw had a little cottage where he worked that could be turned according to the position of the sun. " As these few examples indicate, it is above all those active in the arts who intuitively grasp the positive influence of sunlight on the psycho-physical effi ciency of their organism.

The book describes the effects of natural as well as artificial electromagnetic energies covering the en tire measurable frequency range from the highest frequencies, x-rays, through microwaves, radio waves, and finally extremely low frequency (ELF) waves.

However, the choice of topics is vast There are chapters on the history of oxygen, oxygen in the universe, the biochemistry of oxygen, and clinical uses of oxygen.

In the course of the very first experimental series, it became clear that humans possess an "internal clock" as had been established in various organisms, protists, plants, and animals, and that human circadian rhythms fit the general regularities of biological rhythms known at that time.