The need for more sophisticated pollution controls at power plants as led to an increased demand for limestone. And a quarry in Meade County has installed new equipment to meet that demand.

Power plants have to reduce sulfur dioxide emissions, and one popular way of doing that is running it through layers of crushed limestone mixed with water. The sulfur dioxide bubbles through the high-calcium limestone, and doesn’t go out the smokestack.

On August 15, the Department of Homeland Security began accepting applications for the program known as Deferred Action for Childhood arrivals. It would allow some undocumented immigrants who came to this country as children to obtain temporary immunity from deportation. LEO Weekly’s Anne Marshall joined us on Friday's Byline to talk about the program and some local young people who are applying for it.

A Tea Party rally featuring Kentucky Senators Mitch McConnell and Senator Rand Paul was held earlier this week in Frankfort to protest President Obama’s health care law. WFPL's Phillip Bailey and Kentucky Public Radio's Kenny Colston were there, and they joined us on Friday's Byline to let us know what they saw.  

A new documentary on the late civil rights icon Anne Braden is coming out.

The Louisville social justice advocate died in 2006 at the age of 81 and dedicated her life to civil rights. Braden gained notoriety as an affluent southern white woman who led many campaigns against Jim Crow laws at the height of segregation.

Check out the trailer:

I talked with Braden biographer and historian Cate Fosl, who is the director of the Anne Braden Institute at the University of Louisville. We talked about Braden’s legacy, the new film and if her brand of social justice still matters in a so-called post-racial America.

Tropical Storm Isaac has been difficult to track, but its potential to affect Florida has caused the Republican National Convention to change its plans. Events for Monday have been canceled, though the committee will convene briefly. As Alan Greenblatt reported for It's All Politics, this is now the second-consecutive Republican National Convention to be delayed by a storm.

Update at 8:55 p.m. ET. Nomination Delayed:

Days before his speech at the Republican National Convention, U.S. Sen. Rand Paul, R-Ky., is warning Americans about a "war going on" between those who respect the Constitution and those who do not.

Paul delivered the message in the GOP weekly address on Friday, and says many of the country's problems could have been resolved over the past two years if President Obama had worked with congressional Republicans.

Next week, a ceremonial groundbreaking will be held for a road extension in Clark County, Indiana.  The three million dollar contract is among the first for the Ohio River Bridges Project, which after more than 40 years of study, debate, and untold public hearings is moving forward.  The project of course includes a new East End bridge, with construction overseen by Indiana.   The Kentucky-managed part of the project includes a new downtown bridge and the reworking of Spaghetti Junction.

The Louisville Orchestra has announced its 2012-2013 season, and General Manager Lindsay Vallandingham joined WFPL's Erin Keane on Friday afternoon to talk about what's on their schedule this season.