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Months in prison didn't rid Daryl of his addiction to opioids. "Before I left the parking lot of the prison, I was shooting up, getting high," he says.

Daryl has used heroin and prescription painkillers for more than a decade. Almost four years ago he became one of more than 200 people who tested positive for HIV in a historic outbreak in Scott County, Ind. After that diagnosis, he says, he went on a bender.

Part 4 of the TED Radio Hour episode What Makes Us ... Us

About Anil Seth's TED Talk

When we look around, it feels like we're seeing an objective reality. But neuroscientist Anil Seth says everything we perceive, from objects to emotions, is an act of informed guesswork by the brain.

About Anil Seth

Copyright 2018 NPR. To see more, visit http://www.npr.org/.

ARI SHAPIRO, HOST:

Sarah Stewart likes to think about what happens when planets collide. She uses two actual cannons to simulate those massive impacts. Here's one firing in her lab at UC Davis.

UNIDENTIFIED PERSON: Firing in three, two, one.

Have you ever noticed that when something important is missing in your life, your brain can only seem to focus on that missing thing?

Life lately in the tiny northern Minnesota town of Gilbert has resembled a scene out of an Alfred Hitchcock film. Birds, lots of birds, have been "flying into windows, cars and acting confused," according to the city police department, which has been fielding reports from anxious residents.

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