Back in 2004, NBC’s 'To Catch a Predator' captivated millions of viewers as it followed a vigilante group called Perverted Justice, which has a goal to thwart pedophiles searching the internet for minors. Adult volunteers go online to pose as minors in order to, well, catch predators. Three years later, amid its growing popularity, it came to an end. But nearly two decades later, it's inspired a genre of influencers who have tried to fill the void.

The popular YouTube channel Lofi Girl provides a 24/7 livestream of chill beats to relax and study. Endless Thread producer Nora Ruth Valerie Saks and co-host Ben Brock Johnson look at how the Lofi Girl phenomenon has expanded into a record company, inspired copycats, and prompted academic research.

On Discord and YouTube, hundreds of Gen-Zers are teaming up for the purposes finding and archiving the Muzak (aka elevator music) that played in the plaza and lobby and mall of the Twin Towers.  On this 22nd anniversary of 9/11,  join Endless Thread in an episode where teens and young 20-somethings collect the seemingly innocuous sonic artifacts of the original World Trade Center people thought were lost and the lengths they've gone to find them.

The cover art for the 1976 paperback edition of Madeleine L'Engle's classic sci-fi/fantasy novel "A Wrinkle in Time" — featuring a rainbow-winged centaur and a green, glowering, red-eyed face — is iconic. And yet, for nearly 50 years, no one has known who illustrated it. Well, not NO ONE. Not anymore... Endless Thread cracks the case!

A Redditor proposed a quick fix to one of humanity’s greatest threats. But the real threat may be our fixation with quick fixes. Credits: This episode was written and produced by Dean Russell. Mixing and sound design by Emily Jankowski. Amory Sivertson and Ben Brock Johnson are the co-hosts. (Photo by George Rose/Getty Images)