colm toibin, thank you very much. >> thanks, jeff.u very much. >> woodruff: and now a story about the founding of our nation. a distant ancestor of rohulamin quander was enslaved at george washington's mt. vernon estate in virginia. quander is now a tour guide there where he offers a unique perspective on the contributions of african americans to our country's history. this story was filmed, edited and produced by middle and high school students who are part of the newshour's student reporting labs program. >> the past always has an impact on the future. those who do not know their past are kind of destined to repeat it. >> we have that program every year. >> i've been coming here all my life, i remember when i was like about 12 years old. but i didn't fully understand or appreciate the family's longstanding connection. >> we're going to go up to the exhibit "lives bound together: slavery at george washington's mt. vernon." >> i am a licensed tour guide in the district of columbia and i come and i bring groups all over the metropolita