In sum, if it seems that I have simply misunderstood what Kant and deontology are all about,
it's because I am advancing an alternative hypothesis to the standard Kantian/deontological understanding
of what Kant and deontology are all about. I am putting forth an empirical hypothesis
about the hidden psychological essence of deontology, and it cannot be dismissed a priori
for the same reason that tropical islanders cannot know a priori whether ice is a form of water.
- Joshua Greene's (2008, p. 74) 'The secret joke of Kant's soul'
Evolutionary History of the Human Brain
Big History is a discipline that examines history from the Big Bang to the present:
Cenozoic era (also known as the age of mammals): The current geologic era
2.6 mya-11,700 years ago
Pleistocene epoch of the Quaternary period of the Cenozoic era
The first modern humans or Homo sapiens emerged 300,000-200,000 years ago
11,700 years ago-present
Holocene epoch of the Quaternary period: The current geologic epoch
2,600 years ago
Birth of Western philosophy following the emergence of the Presocratics
 'mya' denotes 'million years ago'
We are currently in the Holocene epoch of the Quaternary period of the Cenozoic era of the Phanerozoic eon
We share our capacities for moral reasoning, moral judgment, and moral decision-making with our Pleistocene epoch hunter-gatherer ancestors
'Our modern intellectual constitution was probably achieved in this [Pleistocene] period by about fifty thousand years ago, fully forty thousand years before the founding of the first cities and the invention of writing.'
- Denis Dutton's (2009, p. 42) The Art Instinct