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## Math Here and Now

 Benford's Law and Tax DayThe IRS can start to identify cheating by simply looking at the first digits of the figures on a tax return. In certain situations—for sets of data with specific attributes—numbers are much more likely to start with lower digits than higher ones. How can this be and why? Pandemics—How Are Viruses Spread?An applet to predict the spread of a virus over a population. The spread of a virus is influenced by four factors. Manipulate those variables to create different outcomes. Results are modeled in a logistic curve, an S-shaped curve that describes population growth—of both viruses and people—as well as other phenomena in economics and science. The Math of Voting MethodsThere is more than one way to decide an election. U.S. voters use the plurality method--voters choose one candidate; the winner is the candidate who receives the most votes. But other methods allow voters to vote for more than one candidate. Those methods include ranking the candidates in order from best to worst (Borda Count), dividing points among the candidates (Weighted Voting), comparing one candidate to another (Condorcet Method), and identifying which candidate(s) are acceptable (Approval). Different voting methods can give very different results. Is there a single method that would be the most fair?

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