An assortment of organic vegetables is seen on display. A growing body of evidence documents how farming methods can influence the nutritional content of foods. Justin Sullivan/Getty Images hide caption

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This undated photo shows Rosa Parks riding on the Montgomery Area Transit System bus. Parks refused to give up her seat on a Montgomery bus on Dec. 1, 1955, and ignited the boycott that led to the end of legal segregation in public transportation. AP hide caption

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60 Years Later, What Can Activists Learn From The Montgomery Bus Boycott?

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Young people attend a political rally before the recent Jefferson-Jackson dinner in Iowa. Energizing young voters may be a challenge for presidential candidates ahead of 2016. Charlie Neibergall/AP hide caption

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#NPRYouthVote: Will Young Voters Lead Or Lag In 2016?

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Desiree Griffiths of Miami holds up a sign reading "Black Lives Matter" during a protest over the deaths of Michael Brown and Eric Garner. Lynne Sladky/AP hide caption

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The #BlackLivesMatter Movement: Marches And Tweets For Healing

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A protester stands in front of police vehicles with his hands up during a demonstration in Ferguson, Mo., where in August 2014 a white police officer shot and killed an 18-year-old black man. Justin Sullivan/Getty Images hide caption

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Carlos Santana visits NPR for an interview about his new memoir The Universal Tone: Bringing My Story to Light. Maggie Starbard/NPR hide caption

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Carlos Santana: 'I Am A Reflection Of Your Light'

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NPR's Michele Norris on Morning Joe. She joined the MSNBC program on the 50th anniversary of the March on Washington. screenshot from MSNBC.com hide caption

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Use #NPRAspen to share your ideas about improving education and learning. NPR hide caption

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Ione Brown, at age 47, is featured in a northern Minnesota newspaper, the Park Region Echo in 1950. Brown is the maternal grandmother of NPR's Michele Norris, co-host of All Things Considered. In an upcoming interview with host Michel Martin, Norris shares her family's complex history with matters of race, as chronicled in her new memoir The Grace of Silence.. 'The Grace of Silence' by Michele Norris hide caption

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