Watch: Obama, Raul Castro, Maya Angelou Honor Nelson Mandela

Tens of thousands gathered at the FNP Stadium in Soweto near Johannesburg today for a memorial to honor Nelson Mandela, who died last week at the age of 95. Nearly 100 heads of state traveled to South Africa for the memorial, including President Obama and Cuban President Raúl Castro. Mandela’s body will then lie in state for three days at the Union Buildings in Pretoria, where he was sworn in as president in 1994. He will be buried on Sunday in Qunu, his ancestral home. We begin our coverage of the memorial with President Obama’s address. "It took a man like Madiba to free not just the prisoner, but the jailer as well," Obama said. "While I will always fall short of Madiba’s example, he makes me want to be a better man."

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Imagine you've forgotten once again the difference between a gorilla and a chimpanzee, so you do a quick Google image search of “gorilla." But instead of finding images of adorable animals, photos of a Black couple pop up.

Is this just a glitch in the algorithm? Or, is Google an ad company, not an information company, that's replicating the discrimination of the world it operates in? How can this discrimination be addressed and who is accountable for it?

“These platforms are encoded with racism," says UCLA professor and best-selling author of Algorithms of Oppression, Dr. Safiya Noble. “The logic is racist and sexist because it would allow for these kinds of false, misleading, kinds of results to come to the fore…There are unfortunately thousands of examples now of harm that comes from algorithmic discrimination."

On At Liberty this week, Dr. Noble joined us to discuss what she calls “algorithmic oppression," and what needs to be done to end this kind of bias and dismantle systemic racism in software, predictive analytics, search platforms, surveillance systems, and other technologies.

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