In The Joy of X: A Guided Tour of Math, from One to Infinity, mathematician Steven Strogatz provides an entertaining refresher course in math, starting with the most elementary ideas, such as counting, and finishing with mind-bending theories of infinity--including the idea that some infinities can be bigger than others.
Last month, the U.S. Alcohol and Tobacco Tax and Trade Bureau approved a powdered alcohol product, making both parents and lawmakers nervous. Some states have already banned powdered alcohol. NPR's Arun Rath speaks with Brent Roth of Wired, who made his own powdered concoction and put it to the test.
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