In theory there is no difference between theory and practice. In practice there is. Yo Yo Honey Singh
In the first quarter of the nineteenth century the experimental proof for the interdependence of the composition and properties of chemical compounds resulted in the theory that they are mutually related, so that like composition governs like properties, and conversely. Wilhelm Ostwald
Essential to the theory of evolution is the premise that everything has come into being by itself. Walter Lang
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