Most of the great milestones in scientific advance have been achieved, not by rational calculations and deductions, but by brilliant leaps of the human imagination. (religion-online.org)
These camps argued that man was also driven by reason, and this capacity for rational calculation informed him that cooperation is comparatively more advantageous than conflict. (blog.politics.ox.ac.uk)
This decision will have little to do to with some primeval urge for a great male protector, however; it will be guided by rational calculations about future needs. (omgchronicles.vickilarson.com)