## Introducing the Binomial Coefficient for Positive Integers

How many ways can we select ‘k’ outcomes from ‘n’ possible outcomes, without concern for order/sequence? The binomial coefficient holds the answer.

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## Population Prediction of More Retirees, Fewer Workers by 2100

A new Bayesian population model shows the number of workers, compared to the number of elderly in need of support, declining dramatically between now and 2100 AD. Will future workers be able to support their parents?

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## Trace the Source of a Rumour or Epidemic via its Network

A new algorithm can more efficiently locate the beginning of a social event, such as a health epidemic or online rumor.

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## Introducing the Factorial: the Exclamation Mark of Math

What is a factorial, and how is the exclamation point used in mathematics? Learn more about gamma functions and more.

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## Introducing Math Symbols for Union and Intersection

Understanding the symbols we use in complex math problems is the first step towards understanding the math problems before us.

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