When people fall in love, there´s period of up to three years during which the zeal and infatuation ride at a peak. The internal signals in the body and breain are literally a love drug. And then it beginds to decline. From this perspective, we are preprogramed to lose interest in a sexual partner after the time required to raise a child has passed - which is, on average, about 4 years.
David EaglemanThe more familiar the world becomes, the less information your brain writes down, and the more quickly time seems to pass.
David EaglemanSocieties would _not_ be better off if everyone were like Mr Spock, all rationality and no emotion. Instead, a balance - a teaming up of the internal rivals - is optimal for brains. ... Some balance of the emotional and rational systems is needed, and that balance may already be optimized by natural selection in human brains.
David EaglemanIf you are a carrier of a particular set of genes, your probability of committing a violent crime goes up by eight hundred and eighty-two percent.
David Eagleman