Commuters at the Staten Island Ferry Terminal in New York City. Photo: Getty Images Shrinking consumer spending and recent stock market plunges reflect rising concerns about the true health of the ...

In 1886 the mathematician Leopold Kronecker famously said, “God Himself made the whole numbers — everything else is the work of men.” Indeed, mathematicians have introduced new sets of numbers besides ...

Find one million consecutive positive numbers, none of which are prime. Ancient math tells us that prime numbers (2, 3, 5, 7, 11, ...,), which have no factors except for 1 and themselves, go on ...

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