What discovery was the basis for a revised calculator

In 1642 one Blaise Pascal created a device that could perform arithmetic operations with just two numbers. ... The inspiration for Pascal's calculator, arithmetic machine or Pascaline, was his frustration with the laborious nature of arithmetical calculations his father had to perform as the supervisor of taxes in Rouen.

Great Zimbabwe is a medieval city in the south-eastern hills of Zimbabwe near Lake Mutirikwe and the town of Masvingo. It was the capital of the Kingdom of Zimbabwe during the country's Late Iron Age.It is estimated that the central ruins and surrounding valley supported a Shona population of 10,000 to 20,000. With an economy based on cattle husbandry, crop cultivation, and the trade of gold on the coast of the Indian Ocean, Great Zimbabwe was the heart of a thriving trading empire from the 11th to the 15th centuries. The word zimbabwe, the country’s namesake, is a Shona (Bantu) word meaning “stone houses.”The Hill Complex, which was formerly called the Acropolis, is believed to have been the spiritual and religious centre of the city. It sits on a steep-sided hill that rises 262 feet (80 metres) above the ground, and its ruins extend some 328 feet (100 metres) by 148 feet (45 metres). Great Zimbabwe was largely abandoned during the 15th century. With the city’s decline, its stoneworking and pottery-making techniques seem to have transferred southward to Khami (now also in ruins). Portuguese explorers probably encountered the ruins in the 16th century, but it was not until the late 19th century that the existence of the ruins was confirmed, generating much archaeological research. Hope this helped...My fingers hurt now XD ,Im proud i dinnt copy and paste this...but i did use a website to help