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In order to understand the most radical extremism in the world, Julia Ebner goes undercover online to some of the darkest corners of the internet - including ‘incel’ forums.

A creepy video is mysteriously posted online & goes viral. The clues internet sleuths uncover are bone-chilling, including audio spectrograms of the video spelling out “You Are Already Dead” & depicting graphic scenes of torture…

Motherboard investigates The Swedish Fish Theory, learning how personal gestures can change behavior in an increasingly impersonal world.