The fall of a given weight from a height of around 365 meters corresponds to the heating of an equal weight of water from 0ยฐ to 1ยฐ.
Robert MayerNature has put itself the problem how to catch in flight light streaming to the earth and to store the most elusive of all powers in rigid form. To achieve this aim, it has covered the crust of earth with organisms which in their life processes absorb the light of the sun and use this power to produce a continuously accumulating chemical difference. ... The plants take in one form of power, light; and produce another power, chemical difference.
Robert MayerTruly I say to you, a single number has more genuine and permanent value than an expensive library full of hypotheses.
Robert Mayer