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# How Is Calculus Used in the Real World?

**In the real world, calculus is used to build search engines and weather models, to study epidemiology and to construct buildings and bridges.** Algorithms derived from calculus also allow searches to be conducted on social media sites like Facebook and Twitter.

Major search engines like Google and Yahoo use calculus every day to create algorithms that make it easy to search for specific data. These algorithms combine geographic information, Web history and webpage reviews to find precise facts. Companies such as Facebook use these formulas to help users search for people or pages on their sites.

Weather models are built by computers that use calculus-derived algorithms to predict future weather. The computers are capable of sorting through factors like wind speed, temperature and region to depict an accurate picture of the weather. Calculus also provides the foundation for the equations meteorologists use to calculate the impact of changes in temperature and atmospheric pressure.

Public health is impacted by calculus via epidemiology, which is the study of the spread of infectious disease. The number of people already infected by a disease and the number of people not infected are put into equations that predict infection rates and speeds, origination points and the most effective modes of treatment.

Calculus is a significant factor in the architecture of buildings and bridges. Algorithms take into account factors such as supporting weight needed, distance and local weather patterns to create the safest and most attractive designs possible.

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