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NASA's first Landsat mission launched in July 1972. Seven more satellites have been launched since. Two of these, Landsat 7 & 8, are still active. The program acquired science imagery of natural disasters, urban change, water, ice, and farming.

Many African-Americans have struggled to trace their family trees, thanks in part to the lack of documentation kept for generations of slaves. But new genetic techniques, drawing information from the most genetically diverse group of humans on Earth, are allowing them to get a glimpse of that stolen heritage. See geneticists Catherine Ball and Brenna Henn in discussion with moderator and broadcast journalist Randall Pinkston in this selection from "It's All Relatives," a program of the 2014 World Science Festival.

Watch the Full Program Here: https://youtu.be/wmP6qhPe83I
Original Program Date: May 29, 2014

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