Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.
With the death of a possible suspect in one notorious case, activists are weighing the FBI's efforts to tackle cases from the 1950s and '60s. Some are calling for a congressional hearing to see whether the FBI has done enough investigating.
Afghanistan is believed to be home to world-class mineral deposits, valued at up to $3 trillion and offering hope for the country's economic future. But in the current environment of uncertainty, investors are nervous and it could be many years before Afghanistan strikes pay dirt.
The bipartisan immigration overhaul proposed by the Senate's Gang of Eight has been the target of scores of amendments. So far, the bill has largely held its own, but its prospects for getting through Congress are uncertain.