  The phenomenon of magnetic resonance (either NMR or ESR) is a responce of
atomic (molecular) system to the external electromagnetic effect. Electrons and
nuclei, which possess magnetic moment, are the "magnetic antennas" in the
biosystem "human being". They are able to receive (radiate) electromagnetic
energy selectively in coordinates $H$ (magnetic field), $\nu$ (frequency) and
$\gamma$ (gyromagnetic ratio). Tuning of these antennas mirrors the state of an
atomic system and its environment. The sea of electromagnetic waves of both
natural and artificial origin surrounds a "human being". It contains the set of
frequencies, which fulfill the resonance condition in the geomagnetic field.
This phenomenon is universal for a lot of nuclei and electrons, which
participate in many vital biochemical reactions and processes. The above allows
one to speak about the existence of a natural channel for energy (information)
transfer using the radio-frequency range. This channel exists both inside a
biosystem and for communication outside. The possible ways of realization of
such a channel and trends of its application are discussed.
