By-product

Happiness is not achieved by the conscious pursuit of happiness; it is generally the by-product of other activities.

Happiness is not a goal. It's a by-product of a life well lived.

Cattle, such as dairy cows or beef cattle produce methane as a by-product of digestion.

The unexpected by-product of the calculation was that Earth may be unique, actually an aberration among myriads of dead, uninhabitable worlds.

It was about this time that the first experiments were made (in Germany) with basic slag, a material which had hitherto been regarded as a worthless by-product of steel manufacture. A year or two later field trials were begun in England, with the final result that basic slag has become recognized as a valuable source of phosphorus for growing crops, and is now in constant demand for application to the soil as a fertilizer.

The many Indian restaurants all over Britain are a by-product of the large waves of immigration from the subcontinent.

One of the most obvious results of the B.R. Modernisation Plan has been the increasing use of diesel and electric traction; a less obvious by-product is the increase in track damage possible with the new forms of traction.