Propel Quotes (2 quotes)
It is sunlight in modified form which turns all the windmills and water wheels and the machinery which they drive. It is the energy derived from coal and petroleum (fossil sunlight) which propels our steam and gas engines, our locomotives and automobiles. ... Food is simply sunlight in cold storage.
Organisms are not billiard balls, propelled by simple and measurable external forces to predictable new positions on lifes pool table. Sufficiently complex systems have greater richness. Organisms have a history that constrains their future in myriad, subtle ways.