Traffic isn't just bad for our moods — it's also hurting the planet. Reporter Daniel Gross delves into the underlying engineering behind traffic jams, and how cleaning them up will also reduce emissions.
New economic data from the federal government show the economy added a paltry 18,000 jobs in June, pushing the unemployment rate back to 9.2 percent. Dan Gross, columnist and finance editor for Yahoo! Finance, gives his analysis of the numbers.