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Can math really save your life? Of course it can! Math has applications to many problems that are vital to our health and happiness. For example, Florence Nightingale saved countless lives by a careful application of mathematics in the form of medical statistics (and went on to become the first female member of the Royal Statistical Society).

How many strings of lights can you safely plug into one electrical outlet? It depends. Now's the time of year when many households test the capacity of electrical outlets; they deck the house with strings of lights and maybe a twinkling reindeer or a giant penguin that pops in and out of an inflatable box.