Schauberger
To say more about this here would be pointless, because up to now nobody knew anything about the ur-causal energies that dwell in every substance, and especially in very ordinary pebbles. When these are rubbed together under water they produce a gleam of cold light. This is an indication that the bipolar basic elements are mature, ready for release and can be used to generate those forms of temperature, which maintain us and all we see around us in the unstable thermal equilibrium that maintains health. [The Energy Evolution - Harnessing Free Energy from Nature, The Economy Founded on Reactively Produced Energy]

In order to counter these opposing views practically, test pipes 64 metres long with an internal diameter of 27.5 cm (11 inches) were fabricated. At a gradient of 1%, ore and pebbles with a grain-size of about 10 cm (4 inches) in cross-section were transported down the pipe. The experiments were carried out at Kohlleben. The steeper the geological gradient was, the more efficacious the transport. [The Energy Evolution - Harnessing Free Energy from Nature, The Transport of Ore in Double-Spiral-Flow Pipes]

See Also

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cornerstone
flow-guiding stone
gall stone
gallstones
keystone
kidney stone
loadstone
lodestone
pebble
Philosophers Stone
Rosetta Stone
rotten stone
steppingstone
stone
stones into bread