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.

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.

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.

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.

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.

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.

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.

DNA analysis has given us the tools to map disease, solve crimes and more. But in our rush to decode DNA, are we leaping before we look?

The episode was rated 7.42 from 99 votes.

In the 21st century, China has become a global economic powerhouse. Why was the rest of the world so slow to notice its rise to the top?

The episode was rated 7.44 from 138 votes.

Plastics have transformed how we live, but progress comes at a high price: 7.8 billion tons of waste. Are plastics a miracle or a catastrophe?

The episode was rated 7.46 from 112 votes.