Originally published on Fri December 6, 2013 1:20 pm
If you want to eat a more healthful diet, you're going to have to shell out more cash, right? (After all, Whole Foods didn't get the nickname "Whole Paycheck" for nothing.)
But until recently, that widely held bit of conventional wisdom hadn't really been assessed in a rigorous, systematic way, says Dr. Dariush Mozaffarian, a cardiologist and epidemiologist at the Harvard School of Public Health.
Drawing from research presented at this year's Acoustical Society of America conference, psycholinguist Stefanie Shattuck-Hufnagel untangles tongue twisters to look at speech planning patterns, and professor Amalia Arvaniti discusses the "Valley Girl" dialect.
In 2008, Congress passed a law requiring most rail networks to install "positive train control" collision technology by 2015. Engineering professor Christopher Barkan discusses train safety systems, how "positive train control" might prevent accidents, and whether railroads will be able to meet the deadline.
For 25 seasons, The Simpsons writers have been smuggling math onto Americans' TV screens. Author Simon Singh helps Ira decode the show's numberplay, while former Simpsons writer David X. Cohen remembers how he helped Homer solve Fermat's Last Theorem (sort of).