Meet one of the Internet’s most prolific distributors of hyper-partisan fare. From California, Cyrus Massoumi caters to both liberals and conservatives, serving up political grist through various Facebook pages. Science correspondent Miles O’Brien profiles a leading purveyor of junk news who has hit the jackpot exploiting the trend toward tribalism.

This is the second Junk News series for the PBS NewsHour. You can watch the first installment here, and catch more of the conversation with Massoumi and Miles O’Brien’s on his podcast, Miles To Go.

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Stephen Hawking changed our perception of black holes and the Big Bang. Here’s how he changed my life.

Stephen Hawking overcame the loss of his working limbs and voice to become the best-known theoretical physicist of his era, upending the scientific consensus that nothing escapes the intense gravity of black holes. Earning countless honors, he used his fame to appeal for saving the Earth. Science correspondent Miles O’Brien joins Hari Sreenivasan to remember Hawking, who died Wednesday at 76.

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