The Dobrotiva Formation is a fossil formation situated in the North West of the Czech Republic. The town of Osek is built upon it. The Dobrotiva formation contains many valuable trilobites.
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“The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.”
—Aristotle (384–322 B.C.)