Most nations operate in the capitalist system of production and consumption.
Since the end of the feudal system, the world underwent transformations that culminated in economic systems based on barter and mercantilism, which in turn allowed for the existence of industrial revolutions and which were the basis for the capitalist system of production as it is today.
In last century, Capitalism and communism competed for world hegemony until the end of the Cold War, when the bipolarized world gave way to what today times capitalist hegemony in most countries with a few countries in communist systems.
Our best estimate for the age of the universe is based on what we currently know about the universe's history is 13.772 billion years.
<h3>How to calculate the age of the universe?</h3>
There are two methods by which the scientists calculate the age of the universe:
By searching for the oldest stars
By calculating the rate of expansion of the universe and generalizing back to the Big Bang Theory.
Thus, Our best estimate for the age of the universe is 13.772 billion years.
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Domesticating animals learned it freshman year
