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"Old Style" (OS) and "New Style" (NS) are sometimes added to dates to identify which system is used in the British Empire and other countries that did not immediately change. Because the Calendar Act of 1750 altered the start of the year, and also aligned the British calendar with the Gregorian calendar, there is some confusion as to what these terms mean. They can indicate that the start of the Julian year has been adjusted to start on 1 January (NS) even though contemporary documents use a different start of year (OS); or to indicate that a date conforms to the Julian calendar (OS), formerly in use in many countries, rather than the Gregorian calendar (NS).

When was the Calendar act enacted?
Answer: 1750
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Natives of North America began practicing farming approximately 4,000 years ago, late in the Archaic period of North American cultures. Technology had advanced to the point that pottery was becoming common and the small-scale felling of trees had become feasible. Concurrently, the Archaic Indians began using fire in a controlled manner. Intentional burning of vegetation was used to mimic the effects of natural fires that tended to clear forest understories. It made travel easier and facilitated the growth of herbs and berry-producing plants, which were important for both food and medicines.

What had pottery become 4,000 years ago in the Americas?
Answer: common
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This boom was reflected in the growth of artistic and cultural pursuits. Some of the most emblematic buildings of the city were built during this period, including the Serranos Towers (1392), the Lonja (1482), the Miguelete and the Chapel of the Kings of the Convent of Santo Domingo. In painting and sculpture, Flemish and Italian trends had an influence on artists such as Lluis Dalmau, Peris Goncal and Damia Forment. Literature flourished with the patronage of the court of Alfonso the Magnanimous, supporting authors like Ausias March, Roic de Corella, and Isabel de Villena. By 1460 Joanot Martorell wrote Tirant lo Blanch, an innovative novel of chivalry that influenced many later writers, from Cervantes to Shakespeare. Ausias March was one of the first poets to use the everyday language Valencian, instead of the troubadour language, Occitan. Also around this time, between 1499 and 1502, the University of Valencia was founded under the parsimonious name of Estudio General ("studium generale", place of general studies).

When was the University of Valencia founded?
Answer:
between 1499 and 1502