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Species of the infraorder Cetacea A phylogenetic tree showing the relationships among cetacean families. [1]The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. [2]
The neocortex of many cetaceans is home to elongated spindle neurons that, prior to 2019, were known only in hominids. [33] In humans, these cells are thought to be involved in social conduct, emotions, judgment and theory of mind. [34]
Cetaceans are famous for their high intelligence, complex social behaviour, and the enormous size of some of the group's members. For example, the blue whale reaches a maximum confirmed length of 29.9 meters (98 feet) and a weight of 173 tonnes (190 short tons), making it the largest animal ever known to have existed.
Prehistoric warfare refers to war that occurred between societies without recorded history.. The existence—and the definition—of war in humanity's hypothetical state of nature has been a controversial topic in the history of ideas at least since Thomas Hobbes in Leviathan (1651) argued a "war of all against all", a view directly challenged by Jean-Jacques Rousseau in a Discourse on ...
The branch of social science that studies politics and government is referred to as political science. Politics may be used positively in the context of a "political solution" which is compromising and non-violent, [1] or descriptively as "the art or science of government", but the word often also carries a negative connotation. [2]
Military theory is the study of the theories which define, inform, guide and explain war and warfare. Military theory analyses both normative behavioral phenomena and explanatory causal aspects to better understand war and how it is fought. [1] It examines war and trends in warfare beyond simply describing events in military history. [2] While ...
Conversely, bellicose democratic leaders can rely on the acknowledgement of the legitimacy of the democratic process, as pacifist actors in democracies will need to respect the legitimacy of a democratically elected government. If pro-war groups can capture the organs of the state in a democracy legitimately, then anti-war groups will have ...
A woodcut of the Defenestrations of Prague in 1618—which began the Thirty Years' War and ended with the Peace of Westphalia that started the recognition of the modern state. Two related theories are based on military development and warfare, and the role that these forces played in state formation.