CultsHow do cults lure people in and exert control? Learn a cult’s telltale signs, and how loneliness and life online makes indoctrination easier than ever.
Billionaires
E2
BillionairesThere are more billionaires than ever. But how does this vast accumulation of wealth affect the world? Mark Cuban and Bernie Sanders offer insights.
Animal Intelligence
E3
Animal IntelligenceWhat goes on inside an animal's mind? Figuring out how they think and feel might just be the key to understanding our own place in the world.
Athleisure
E4
AthleisureIt began with bloomers. Then came spandex. Now we sport leggings and other activewear everywhere. How did comfy, casual clothing go mainstream?
Coding
E5
CodingComputer code now controls how we live. But how did these programming languages evolve? And how can they be used to build a new and better world?
Pirates
E6
PiratesIn pop culture, pirates are often depicted as booty-looting rogues, but their history is far more complicated. See how they became enemies of humanity.
The Next Pandemic
E7
The Next PandemicIf you're not worried about a looming global pandemic, you probably should be. Are we prepared for an outbreak? Bill Gates and other experts weigh in.
The Future of Meat
E8
The Future of MeatThe planet's current rate of meat consumption is unprecedented -- and becoming unsustainable. In the future, will meat alternatives be the answer?
Beauty
E9
BeautyBeauty may be in the eye of the beholder, but what exactly makes things such as art and architecture aesthetically pleasing, and why do we like looking?
Diamonds
E10
DiamondsA diamond is forever. But why is that? Dig into how these mined pieces of carbon became both a status symbol and a sparkly sign of everlasting love.
Cast of Season 2
Claire GordonProducer
Joe PosnerProducer
Watch Season 2 Videos
Explained: Season 2
Explained: Season 2Trailer
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