NPR News

This chart offers another perspective on just how warm it was around the world last month, the National Oceanic and Atmospheric Administration says.

The agency has been keeping records since 1880 and the "average combined global land and ocean surface temperature for September 2012 tied with 2005 as the warmest September on record."

Even extreme stress doesn't have to get you down.

That's the message from brain scientists studying the relationship between stress and problems such as depression, anxiety and post traumatic stress disorder, or PTSD.

Researchers at the Society for Neuroscience meeting in New Orleans presented studies showing how stress caused by everything from battlefield trauma to bullying can alter brain circuitry in ways that have long-term effects on mental health.

More than 100,000 undocumented young people have applied for deferred action, hoping to get a reprieve from the threat of deportation. But after years of living under the radar, many are having trouble finding documents to prove their eligibility. Host Michel Martin talks with Chung-wha Hong of the New York Immigration Coalition.

Rosie Castro was a Mexican-American civil rights activist during the 1970s. She passed down her passion for change to her children: Texas State Representative Joaquin Castro and San Antonio Mayor Julian Castro. For Hispanic Heritage Month, Rosie Castro speaks with host Michel Martin about the Chicano movement and raising her twin sons.

A poll out from ABC News and The Washington Post on Monday, shows President Obama with a slight edge over GOP nominee Mitt Romney. As the candidates head into Tuesday night's debate, host Michel Martin gets the latest on election news from Republican strategist Ron Christie and Corey Ealons, a former Obama White House advisor.