A perpetual motion machine - this can never exist. But energy sources
nearly disregarded up to now - they exist. These are energy sources,
which have been hardly under investigation, so that mankind did not yet
learn how to get benefit from them. Most part of the universe consists
of such energy, which is still called "invisible". A part of this energy
is to be found within the so called zero-point oscillations of the
quantum vacuum, thus within the empty void from the perspective of
quantum physics. The author of the book is physicist. He theoretically
developed and then experimentally verified a method for the conversion
of vacuum energy into classical mechanical energy. His technique is one
of the very few approaches know up to now. The approaches to convert
vacuum energy are described in this book in many scientific details, and
they are compared with other known proposals for the use of vacuum
energy.