Synaptic summation is the technical term used in neurophysiology for those instances in which some neuron C is fired only by a combination of neurons A and B.
It is impossible, in principle, to explain any pattern by invoking a single quantity.
We do not know enough about how the present will lead into the future.
Wisdom is the intelligence of the system as a whole.
Language commonly stresses only one side of any interaction.
In the nature of the case, an explorer can never know what he is exploring until it has been explored.