Over 10% of the world's electricity comes from nuclear power. But with radioactive waste and the threat of nuclear meltdown, are we playing with fire?

The episode was rated 7.37 from 100 votes.

The home fitness revolution has exploded into a multibillion-dollar industry. Are home workouts a healthy habit... or just hype?

The episode was rated 7.36 from 44 votes.

A groundbreaking medical reproductive procedure has made parenthood possible for millions around the world... but at what cost?

The episode was rated 7.30 from 46 votes.

Fifteen international agencies spend $62 billion every year on space travel. What's fueling our costly — and dangerous — drive to explore the universe?

The episode was rated 7.18 from 145 votes.

Nearly 40 million people are living with HIV. After decades of research and activism, how far have we come in finding a cure and battling the stigma?

The episode was rated 7.16 from 101 votes.

We share the planet with an estimated 9 million robots, from self-driving cars to surgical arms. Could they one day completely replace humans?

The episode was rated 7.15 from 105 votes.

Thanks to dating apps, finding love is easier than ever. But are we now so focused on playing the game that we're missing out on real connection?

The episode was rated 7.11 from 45 votes.

Oil has brought great wealth to the Middle East and ignited major wars. Is it a blessing or a curse for the region, as well as the rest of the world?

The episode was rated 7.09 from 113 votes.

Cheap, quick and tasty, fast food became a culinary craze in the 1950s. But has our quest for convenience created an irreversible health crisis?

The episode was rated 7.08 from 201 votes.

Feminism has ushered in sweeping changes to society, securing rights for women around the world. How much further do we have to go?

The episode was rated 6.98 from 113 votes.