But honestly, if you do a rigorous survey of my work, I'll bet you'll find that biology is a theme far more often than physical science. David Brin
Extreme heroism springs from something that no scientific theory can fully explain; it's an illogical impulse that flies in the face of biology, psychology, actuarial statistics, and basic common sense. Christopher McDougall
If the relationship of father to son could really be reduced to biology, the whole earth would blaze with the glory of fathers and sons. James A.Baldwin